Taken from development.cfg

hexagonit.recipe.download-1.7.post4 (Nexedi's patch) is not compatible
with Python 3 (yet?).

pysvn 1.7.10 already supports Python 3, but this patch did not.

If there is IPv6 on both interface, Linux will put a default route on
ens3 preventing IPv6 to work correctly on ens4.
Even disabling totally IPv6 from inside the host on ens3 may not work.
It is safer to disable it from qemu process directly. Also, it will ease
the configuration of the host.

NBD server is not running until an image is uploaded. Make sure that the
promise doesn't fail until the image is there. Also display a WARNING in
the connection parameter to say that the NBD server is not running.

Recent fixes for proftpd were still not correct, we still have issues with rpath for mod_auth_web and proftpd itself which uses libcap if available, error was:
    
    ======================================================================
    ERROR: setUpModule (test)
    ----------------------------------------------------------------------
    Traceback (most recent call last):
      File "/srv/slappart11/cqg/soft/1ae6b62cded47f49a2e77af2f372cf2a/parts/slapos.core-repository/slapos/testing/testcase.py", line 154, in setUpModule
        installSoftwareUrlList(cls, [software_url], debug=debug)
      File "/srv/slappart11/cqg/soft/1ae6b62cded47f49a2e77af2f372cf2a/parts/slapos.core-repository/slapos/testing/testcase.py", line 348, in installSoftwareUrlList
        raise e
    RuntimeError: /srv/slappart11/cqg/inst/test0-0/tmp/soft/728168be59c5353c6e3c6a6bc4cad052/parts/proftpd/bin/ftpdctl uses system library /lib/x86_64-linux-gnu/libcap.so.2 for libcap.so.2 /srv/slappart11/cqg/inst/test0-0/tmp/soft/728168be59c5353c6e3c6a6bc4cad052/parts/proftpd/libexec/mod_auth_web.so has some not found libraries:
    /srv/slappart11/cqg/inst/test0-0/tmp/soft/728168be59c5353c6e3c6a6bc4cad052/parts/proftpd/libexec/mod_auth_web.so: /usr/lib/x86_64-linux-gnu/libssl.so.1.1: version `OPENSSL_1_1_1' not found (required by /srv/slappart11/cqg/inst/test0-0/tmp/shared/curl/da798e87b4f10345c33fbae0a4593114/lib/libcurl.so.4)
    /srv/slappart11/cqg/inst/test0-0/tmp/soft/728168be59c5353c6e3c6a6bc4cad052/parts/proftpd/sbin/proftpd uses system library /lib/x86_64-linux-gnu/libcap.so.2 for libcap.so.2
    /srv/slappart11/cqg/inst/test0-0/tmp/soft/728168be59c5353c6e3c6a6bc4cad052/parts/proftpd/sbin/in.proftpd uses system library /lib/x86_64-linux-gnu/libcap.so.2 for libcap.so.2
    Ran 0 tests in 530.067s
    ----------------------------------------------------------------------

/reviewed-on nexedi/slapos!685

Because we were simply using "setupClass", all classes where storing
snapshots in the same folder, so if more than one class failed we also
had an error in storing snapshot.

/reviewed-on !683

libcap is a system library that some system may have and some may not,
but we don't want slapos software to depend on the base system.

See also d0a88346

This build command never used the LDFLAGS that we set, so instead
rewrite this to inject path as a -R option that will be passed to
libtool.

Now that we check that we don't link with system libraries ( slapos.core!172 ) we discovered missing rpaths in our executables.

/reviewed-on !682

1.3.6a had a fix for building mod_sftp using OpenSSL 1.1.x, so we can
use default openssl again.
This should fix problems with proftpd-mod_auth_web that was linked
against curl which already used openssl 1.1

We don't seem to need it and we don't want configure script to pickup
system one.