[Tether07] Migrate Tethering into module
am: 497a062e04

Change-Id: I1aaa034e91eae2d6e9abcbbd70741a54a18b3ddc
tree: 72cd70e35834e8d651bd0d8a5eb4ed9b79dac4f4
  1. core/
  2. services/
  3. tests/