* Also store shared instance list after retrieving it

The SR didn't compile without libssl-dev package. Correctly use the
openssl lib from slapos.

Every restricted python code on python2 will be compiled as if it had
`from __future__ import print_function`, to ease transition away from
python2.

To update project code, 2to3 from python2.7 seems to do a good job.
Invoking like from the root of a repository rewrite all scripts:

    2to3  --write --nobackups --no-diffs --fix=print .

When the backend to redirect to uses scheme standard port it's cleaner to
redirect to URL without the port.

See https://www.rfc-editor.org/rfc/rfc9110.html#name-https-normalization-and-com:

"If the port is equal to the default port for a scheme, the normal form is to
omit the port subcomponent."

I forgot to update hashes after commits b6959875 and 7906b01c.
This commit solves the problem by updating slapos-master hashes.

I used the following commands:
autopep8 test_ors.py --select=E101 --ignore=E121 --indent-size=2 --in-place
autopep8 test.py --select=E101 --ignore=E121 --indent-size=2 --in-place

This parameter no longer exists, this was not removed correctly

"repozo --verify" is not working as this code expects it to: it simply
prints errors in stdout, and doesn't return an error code in case of
error. Thus, running it had absolutely no effect, except wasting IO
and CPU time.

This commit introduces the use of "repozo --recover --with-verify",
which runs the verify and the recover in a same step, and has the
advantage to raise (it doesn't exit with 0) in case of error. Also, as
it does the verification and the recovery at the same time, it uses
half the IO for the read. On a production server using SSDs, with a
ZODB of 1Tb, runner-import-restore now takes 14h instead of 26h, iow a
performance increase of 46%.

See merge request nexedi/slapos!1534

This is needed since version up of pim-dm in cfb05d82

Hello up there. This merge-request brings in major update to ors-amarisoft
software release: first eNB is significantly restructured to prepare base for
further changes, and then we add support for working with multiple radio units
and multiple cells with all LTE/NR and FDD/TDD simultaneously. All kinds of
Carrier Aggregation - LTE+LTE, NR+NR and LTE+NR are now supported. All kinds of
Handover - Intra-ENB, Inter-ENB with LTE→NR and NR→LTE are now supported as
well. UE simulator is also updated to support multiple radio units, cells and
UEs. In the new system configuration of RU, CELL, PEERCELL, PEER and UE objects
are done via shared instances attached to the main eNB or UEsim instance.

Most of the parameters become runtime settings instead of being static choice
of particular software template. There is no longer multiple rendered
softwares - all that remain is

1. `software.cfg` for generic software, and
2. `software-ors.cfg` for ORS.

Switching to configuring things at runtime became possible because SlapOS Master
recently switched to new JSON-editor with support for `oneOf`, arrays and
conditionals - bits that make it possible to configure settings in the WEB UI
with multiple choices for e.g. RF mode, cell or radio unit type.

For ORS full backward compatibility is preserved via special proxy which
translates ORS input schema to configuration objects of the new generic eNB.
Since most our current ORS deployments are TDD, `software-tdd-ors.cfg` link to
`software-ors.cfg` is also provided to preserve backward compatibility at
software-release URL level for those instances.

eNB and gNB are merged along the way. Unittests are improved. JSON schemas
become primary source for defaults(*). Unnecessary parameters are removed and
are now computed automatically. For example it is no longer needed to
explicitly specify SSB NR-ARFCN for peer NR cell, or `txa0cc00_center_frequency`
for Lopcomm RU. `tx_gain` and `rx_gain` become generic parameters that
semantically apply uniformly to all Radio Units.

A protection against buildout code injection via specially-crafted references
of shared instances is installed. The problem was noticed because instantiation
was failing with spaces in the references - a condition that is present by
default on the testnodes. Solving the problem generally via custom "buildout
encoding" was not hard and probably the solution might be useful not only for
ors-amarisoft software release. Please see the patch `"Protect from buildout
code injection"` for details.

There are more minor enhancements and bug fixes in there.

Please see individual patches for details.

Kirill

/cc @jhuge, @lu.xu, @xavier_thompson, @Daetalus
/approved-by @tomo
/reviewed-on nexedi/slapos!1533

(*) this goes in line with similar design choice to make JSON schemas primary
    source of defaults in Rapid-CDN: nexedi/slapos!1380 .

To run tapsplit we use plone.recipe.command with both command and
update-command set to `tapsplit ...`. But tapsplit, when run, currently fully
recreates and reinitializes subtap interfaces, which leads to interfering with
running enb because subtap interfaces, that enb started to use, are removed.
This is not desirable behaviour.

What we need:

1) create subtap interfaces only once and keep them stable
2) until configuration changes which should lead to
   * subtaps recreated, and
   * enb restarted
3) if subtap interfaces disappear for any reason, recreate it

-> Rework tapsplit to keep its promise, that it "brings tap interface into state
   with several children interfaces each covering part of original interface
   address space", without recreating those children on every run and instead
   doing any action only if their state is not what is desired.

In other words those interfaces now are only created when they do not exist
before. Addresses and routes are added only if they are not there before
tapsplit is run, etc.

After the patch the first run of tapsplit to split by 2 looks like

    # ./pythonwitheggs ru/tapsplit slaptap16 2
    slaptap16: split 2401:5180:0:66:a200::/71 by 2
    preserve         2401:5180:0:66:a200::/73
    -> slaptap16-1   2401:5180:0:66:a280::/73
     # ip tuntap add dev slaptap16-1 mode tap user slapuser16
     # ip link set slaptap16-1 up
     # ip addr add 2401:5180:0:66:a280::/73 dev slaptap16-1 noprefixroute
     # ip route add 2401:5180:0:66:a280::1 dev slaptap16-1
     # ip route add 2401:5180:0:66:a280::/73 dev slaptap16-1 via 2401:5180:0:66:a280::1
    -> slaptap16-2   2401:5180:0:66:a300::/73
     # ip tuntap add dev slaptap16-2 mode tap user slapuser16
     # ip link set slaptap16-2 up
     # ip addr add 2401:5180:0:66:a300::/73 dev slaptap16-2 noprefixroute
     # ip route add 2401:5180:0:66:a300::1 dev slaptap16-2
     # ip route add 2401:5180:0:66:a300::/73 dev slaptap16-2 via 2401:5180:0:66:a300::1

The second run with the same arguments looks as

    # ./pythonwitheggs ru/tapsplit slaptap16 2
    slaptap16: split 2401:5180:0:66:a200::/71 by 2
    preserve         2401:5180:0:66:a200::/73
    -> slaptap16-1   2401:5180:0:66:a280::/73
     # slaptap16-1: already exists
     # slaptap16-1: already up
     # slaptap16-1: already has 2401:5180:0:66:a280::/73 addr
     # slaptap16-1: already has 2401:5180:0:66:a280::1 route
     # slaptap16-1: already has 2401:5180:0:66:a280::/73 route
    -> slaptap16-2   2401:5180:0:66:a300::/73
     # slaptap16-2: already exists
     # slaptap16-2: already up
     # slaptap16-2: already has 2401:5180:0:66:a300::/73 addr
     # slaptap16-2: already has 2401:5180:0:66:a300::1 route
     # slaptap16-2: already has 2401:5180:0:66:a300::/73 route

where it could be seen that no actions had been taken.

And if, for example, the user manipulates slaptap16-2 and manually sets it
down, the third run restores it to desired 'UP' state and readds the address
and routes because the kernel removed them when link went down:

    # ip -6 addr show dev slaptap16-2
    157: slaptap16-2: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN group default qlen 1000
        inet6 2401:5180:0:66:a300::/73 scope global tentative noprefixroute
           valid_lft forever preferred_lft forever
    # ip -6 route show dev slaptap16-2
    2401:5180:0:66:a300::1 metric 1024 linkdown pref medium
    2401:5180:0:66:a300::/73 via 2401:5180:0:66:a300::1 metric 1024 linkdown pref medium
    # ip link set slaptap16-2 down
    # ip -6 addr show dev slaptap16-2
    # ip -6 route show dev slaptap16-2
    # ./pythonwitheggs ru/tapsplit slaptap16 2
    slaptap16: split 2401:5180:0:66:a200::/71 by 2
    preserve         2401:5180:0:66:a200::/73
    -> slaptap16-1   2401:5180:0:66:a280::/73
     # slaptap16-1: already exists
     # slaptap16-1: already up
     # slaptap16-1: already has 2401:5180:0:66:a280::/73 addr
     # slaptap16-1: already has 2401:5180:0:66:a280::1 route
     # slaptap16-1: already has 2401:5180:0:66:a280::/73 route
    -> slaptap16-2   2401:5180:0:66:a300::/73
     # slaptap16-2: already exists
     # ip link set slaptap16-2 up
     # ip addr add 2401:5180:0:66:a300::/73 dev slaptap16-2 noprefixroute
     # ip route add 2401:5180:0:66:a300::1 dev slaptap16-2
     # ip route add 2401:5180:0:66:a300::/73 dev slaptap16-2 via 2401:5180:0:66:a300::1

The first version of this patch tried to solve the problem by setting
update-command to be noop instead of reworking tapsplit itself. But as Thomas
noted this does not satisfy requirement "3".

Amends 49ce8ef5 (software/ors-amarisoft: Provide dedicated TAP interface for each Radio Unit)

/helped-by @tomo
/cc @jhuge, @lu.xu, @xavier_thompson, @Daetalus
/reviewed-on nexedi/slapos!1508

 - use caucase for balancer certificate
 - move virtual host logic on the backend
 - change "frontend" parameter to request "" type (and no longer "zope")

See merge request nexedi/slapos!1504