Merge changes from topic "tether_migrate"

* changes:
  [Tether10]Remove UserManagerInternal usage in Tethering
  [Tether07] Migrate Tethering into module
  [Tether07] Clean up build rule for libtetheroffloadjni
tree: 72cd70e35834e8d651bd0d8a5eb4ed9b79dac4f4
  1. core/
  2. services/
  3. tests/