core: added GetAllDiskSnapshotsByStorageDomainIdQuery

Added GetAllDiskSnapshotsByStorageDomainIdQuery for fetching
all volumes (non-active) according to a specific storage domain.

Change-Id: I389579e4120cb33edca594caa762a8bad63362b7
Signed-off-by: Daniel Erez <derez@redhat.com>