Remove dead code. am: 2422319cb7 am: 9d288a6904

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1703126

Change-Id: Ib82c7542b1fdf6d46182694a8b24147b3d7a3b25
tree: 080aa19dd3446fa5695e2e74ba61de479ddff1ec
  1. tests/
  2. Tethering/
  3. .gitignore
  4. OWNERS
  5. PREUPLOAD.cfg
  6. TEST_MAPPING