This is the case in debian 11 when we don't have python2 installed.

See merge request !1247

this package is python3

We no longer need backports.lzma now this test is python3 only

Now that all the problems of running a different version of python in
slapos-node and within the software and now that slapos-node always run
on python3, we no longer need to have two separate test softwares and
two separate suites for python2 and python3 - we have one test suite
for all our softwares, regardless of the python version used by these
softwares and this test suite use python3 to run the tests code and to
run slapos-node

On modern systems it is not installed and anyway slapos should not
depend on host system programs.
Basically same fix as b964b95b (software/fluentd: Fix SR test on Debian
11, 2022-01-04)

we'll only run the test on python3

See merge request !1228

mca--static.cfg provides a statically linked version of mca.
"dep--" means it does not compile all the building dependencies.

Sometimes backends process less than 15% of requests. For this test to
test that the requests are distributed on all backends, testing that
each backend process at least one request should be enough.

Fixed indentation.

See merge request !1243

See merge request nexedi/slapos!1245

See merge request nexedi/slapos!1229

our shacache uploading code for pypi cannot handle the prefix 0 in the version number right now.
it will upload the version 2020.4.5.1 instead of 2020.04.05.1

pango needs glib/glib-mkenums, and glib-mkenums needs python2.7:
-mkenums: /usr/bin/env: ‘python2.7’: No such file or directory

Direct logs to instance's var/log and call postfix's logrotate command,
instead of the slapos-hostile syslog.
Unfortunately, rotated logs will stay in that directory, unlike the
de-facto standard for slapos.

Resolve warnings emitted by postfix commands themselves.

Fixes build on recent libc headers:
set -e; for i in src/util src/global src/dns src/tls src/xsasl src/master src/milter src/postfix src/fsstone src/smtpstone src/sendmail src/error src/pickup src/cleanup src/smtpd src/local src/trivial-rewrite src/qmgr src/oqmgr src/smtp src/bounce src/pipe src/showq src/postalias src/postcat src/postconf src/postdrop src/postkick src/postlock src/postlog src/postmap src/postqueue src/postsuper src/qmqpd src/spawn src/flush src/verify src/virtual src/proxymap src/anvil src/scache src/discard src/tlsmgr src/postmulti src/postscreen src/dnsblog src/tlsproxy src/posttls-finger src/postlogd; do \
 (set -e; echo "[$i]"; cd $i; make 'WARN=-Wmissing-prototypes -Wformat -Wno-comment -fcommon' update MAKELEVEL=) || exit 1; \
done
[src/util]
gcc -I. -I../../include -DUSE_SASL_AUTH -DUSE_CYRUS_SASL -DUSE_TLS -DHAS_PCRE -DHAS_DB -I/home/vifib/software/b3708eca6720657934c5dee0b8247042/parts/libdb/include -I/home/vifib/software/b3708eca6720657934c5dee0b8247042/parts/pcre/include -I/home/vifib/software/b3708eca6720657934c5dee0b8247042/parts/openssl/include -I/home/vifib/software/b3708eca6720657934c5dee0b8247042/parts/cyrus-sasl/include/sasl -I/home/vifib/software/b3708eca6720657934c5dee0b8247042/parts/libnsl/include -DNO_EAI -DHAS_DEV_URANDOM -UUSE_DYNAMIC_LIBS -DDEF_SHLIB_DIR=\"no\" -UUSE_DYNAMIC_MAPS -Wmissing-prototypes -Wformat -Wno-comment -fcommon  -g -O -I. -DLINUX5 -c attr_clnt.c
In file included from attr_clnt.c:87:
./sys_defs.h:763: warning: "HAS_DB" redefined
  763 | #define HAS_DB
      |
<command-line>: note: this is the location of the previous definition
In file included from attr_clnt.c:88:
/usr/include/unistd.h:363:13: error: conflicting types for 'closefrom'; have 'void(int)'
  363 | extern void closefrom (int __lowfd) __THROW;
      |             ^~~~~~~~~
./sys_defs.h:1512:12: note: previous declaration of 'closefrom' with type 'int(int)'
 1512 | extern int closefrom(int);
      |            ^~~~~~~~~
make: *** [Makefile:192: attr_clnt.o] Error 1
make: *** [Makefile:94: update] Error 1

Also, switch from Wietse's own source ftp to a mirror.

The default "skin" changed, which results in diagram being grey instead
of looking like rational rose. The previous behavior can be kept by
using instruction `skin rose` in diagram code (see the changes in tests
for example)