Prevent reinstallation of an already in-use group key am: cf3d326974 am: e86c528b0a  -s ours am: cfd10b2597 am: 3c94b7800d am: 263164faf5 am: 4866a13d7c  -s ours am: 1dd48d0e65  -s ours am: 8a08144e37  -s ours
am: 92067db064  -s ours

Change-Id: I424c01e6d6b4921d1c98eb0f162c3d0ffc18c5a5