CephFS uses the parameter `volumeGroupNamePrefix` for creating VolumeGroups.
This commit renames `groupNamePrefix` to `volumeGroupNamePrefix` for RBD
VolumeGroup creation to ensure consistent naming.
Signed-off-by: Praveen M <m.praveen@ibm.com>
(cherry picked from commit eebfd15e78a184a9abf9321a3d57d91a57ef2a36)