JSON schema uses simple string and internal process, and caddy instances are
not kept simple and are not considered future-proof.

This software can use system gcc. On test nodes we observed successful
builds when system gcc is 8.3.0 and failures with system gcc is 6.3.0:

    checking whether g++ supports C++17 features with -std=c++17... no
    checking whether g++ supports C++17 features with +std=c++17... no
    checking whether g++ supports C++17 features with -h std=c++17... no
    checking whether g++ supports C++17 features with -std=c++1z... no
    checking whether g++ supports C++17 features with +std=c++1z... no
    checking whether g++ supports C++17 features with -h std=c++1z... no
    configure: error: *** A compiler with support for C++17 language features is required.
    ...
    While:
      Installing powerdns.

The test was missing change of the generated file.

Fixes 2048ceb8

There was missing updates in the test itself.

Fixes 14d90bcd

kvm-exporter supported only disk-type=virtio, as qemuqmpclient.driveBackup
source_drive defaults to virtio0.

For disk-type=ide the source_drive found to be ide0-hd0 by query-block during
runtime, and as it's used, now such disk type is supported.

Without a shebang, supervisord refuses to run the script with the
following error:

supervisor: couldn't exec /srv/slapgrid/slappart8/etc/prerm/slapos_wipe_device_disk: ENOEXEC
supervisor: child process was not spawned

This is a fixup of 0983f1ca

Caucase binaries are required for some testing scenarios.

cls.computer_partition_root_path is filled in by super.setUpClass.

Simplify the compilation to default cmmi

Removed already incorporated patch.

Keep old version and use it with software which needs it.

Patch has been adapted to the new version.