Revert "Make distributionManagement reference groups"
Revert "Make distributionManagement reference groups"

This reverts commit 312ee2144e8cff81d9e8ace96413870c213bd4ab.

Change-Id: Id6da0eb93cb10d81cda9fbc3f581b17cef2aa5e6
Signed-off-by: Tony Tkacik <d0658a876d3f3373fb5ecec624b553a76d54e737@cisco.com>

opendaylight/yangtools,NovusTheory/yangtools,opendaylight/yangtools,522986491/yangtools