Merge "Notify the user and turn off tethering when the service is disallowed."...

Merge "Notify the user and turn off tethering when the service is disallowed." into stage-aosp-master am: b9295c7d  -s ours am: 7b3fd55c  -s ours
am: 3668323b  -s ours

Change-Id: I8204085069cd64e881192c054e60dbc11133f07d