When user is not admin, we should skip the setup and tear down
procedures in AllInOneTetherSettings' lifecycle. Also, the switch for
"Hotspot & tethering" on "Network & internet" should be disabled in such
case.
Bug: 151648198
Test: Build and flashed to crosshatch device. Using guest user, the
settings won't crash when using AllInOneTetherSetting and the switch is
disabled.
Change-Id: Ibd2f4111c53b8b9fa6a18504a681a27b966a3c46
3b53b80715