core: improve hibernation volumes to disks
core: improve hibernation volumes to disks

Previously when restoring hibernated VM the memory_volume field in the snapshots
table was cleared, leaving memory_dump_disk_id and memory_metadata_disk_id were
cleared when the disks were removed. However, we should clear them as well since
the remove disk might fail and we don't want the active snapshot to keep
pointing at them in this case.

Change-Id: I2018cc295a3aec3a8b9e9fe60a3b85e6bc862cf0
Signed-off-by: Arik Hadas <4817076c8cbf937260fc19e8bc79ad74394890b9@redhat.com>

OpenUniversity/ovirt-engine,OpenUniversity/ovirt-engine,OpenUniversity/ovirt-engine,OpenUniversity/ovirt-engine,OpenUniversity/ovirt-engine