make tests easier to run and without modifying the test to match the
correct system. Also add tests for volume and vm instance snapshots.
Improve runtime by ~6 minutes.
This adds a volume(primary) storage plugin for the Linstor SDS.
Currently it can create/delete/migrate volumes, snapshots should be possible,
but currently don't work for RAW volume types in cloudstack.
* plugin-storage-volume-linstor: notify libvirt guests about the resize