core: always update volume size when creating a new image #267
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Vdsm often aligns the size of the volume when creating, and the volume
will end up having a different size in the engine than what is on the
storage. This is already handled when a new disk is created but not when
a new snapshot is created.
Since there is already a getVolumeInfo request at the end of snapshot
creation, we can use this opportunity to update the size of the volume
as well.
Bug-Url: https://bugzilla.redhat.com/1852308