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implemented CreateVolumeGroupSnapshot RPC which does below operations * Basic request validation * Reserve the UUID for the group name * Quiesce the filesystem for all the subvolumes from the input volumeId's * Take the snapshot for all the input volumeId's * Add the mapping between volumeId's and snapshot Id's in omap * Release the quiesce for the filesystem for all the subvolumes from the input volumeId's Undo all the operations if anything fails. Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>