This functionality is replaced by ConnectivityManager.startTethering()
and ConnectivityManager.stopTethering().
Bug: 30147602
Test: Can toggle tethering on/off via all of settings, quick settings,
and quick quick settings.
Change-Id: I4d190185c473237982b988f898e76d4997dc401c
...when there is an active hotspot and user restriction for disallowing
tether config is in effect. This is to avoid getting security exceptions
from WifiManager when engaging with HotspotCondition or Wifi enable switch.
Bug:27936528
Change-Id: Ib3324e853277c177966b55668758d349ffe6ecf5
