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
am: ca48fcd2  -s ours

Change-Id: I67af2c1b8561937ddffafd434220c7769d8c4cdf