This commit adds `RegenerateVolumeGroupJournal` to Manager
interface. RegenerateVolumeGroupJournal regenerate the omap
data for the volume group.
This performs the following operations:
- extracts clusterID and Mons from the cluster mapping
- Retrieves pool and journalPool parameters from the VolumeGroupReplicationClass
- Reserves omap data
- Add volumeIDs mapping to the reserved volume group omap object
- Generate new volume group handle
Returns the generated volume group handler.
Signed-off-by: Praveen M <m.praveen@ibm.com>
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