Use unified Tethering Permission Check

The BT and Wifi mechanisms for enabling Tethering did their own
permission checks.  This set of changes unifies the check into
a ConnectivityManager function so they can be kept in sync.

bug:17435527
Change-Id: I8c157a5acf56ffbddd349cb6a45160ae7be8541b
2 files changed
tree: a716abce733b2d6caca1c3244deeece9b135f17c
  1. core/
  2. services/
  3. tests/