We need to remove invalid signature certificate for networkcache from current slapos.cfg file because it prevent slapos to download compiled SR from networkcache.

For more information about this problem, see: nexedi/slapos@04e5d4aa

/reviewed-on nexedi/slapos.package!93

OpenVPN fails to build on Debian testing because
net-tools is no longer provided by default.
Depends on slapos@67eb9fe4

/reviewed-on !92

Commit c5e509c3
added the ability to download from network cache when building re6st,
but slapos.libnetworkcache is imported after bin/buildout has
already been generated. The fixup consists of adding libnetworkcache
in bin/buildout from bin/python, which has been renamed to
bin/python.temp until the end of bootstrap to start again if we fail
before the end of the task.

/reviewed-on nexedi/slapos.package!90

apt package didn't support direct list input for "name" arg. Use
with_items instead.

the IMT settings already contains slapos master urls

This reverts commit 8fdf3f1a.

It's all the more important as OpenVPN tarballs can't be downloaded with
default Python user-agent.

`slapos.libnetworkcache` depends itself on `setuptools`.

/reviewed-on nexedi/slapos.package!88

INSTALL_PREFIX has been deprecated in openssl so it was renamed to DESTDIR and uses the
new `make-install-extra` option added here:  nexedi/slapos!524

/cc @tomo @jm 

/reviewed-on nexedi/slapos.package!87

/reviewed-on !86

Useful for unstable connection to some (distant) servers, also the package is available on chromebrew too.

PS: The package seems also to be available in almost all Linux distributions: https://pkgs.org/download/mosh

/reviewed-on !85

Hello @alain.takoudjou for my on-call duty which starts soon, please merge my ssh key and update all the machines.

/reviewed-on nexedi/slapos.package!84

/cc @jm @rafael 

/reviewed-on !83

this is needed for all servers hosting VMs. As we don't really know which server are hosting VM, we do it on all vifib servers.

/cc @alain.takoudjou @rafael @guillaume.hervier

/reviewed-on !82

This will be useful to setup machines where we already have IPv6 (for example, VM with IPv6 coming from the host).

/cc @alain.takoudjou @guillaume.hervier @rafael

/reviewed-on nexedi/slapos.package!81

This will be useful to setup machines where we already have IPv6 (for
example, VM with IPv6 coming from the host).