[automerger] RESTRICT AUTOMERGE: WifiServiceImpl: fix and add tethering checks am: 38598d8d32 am: 8e4b6ba3c3 am: 5a9d8f6c08

Change-Id: I33b5c8ab4a770b8c0b5ee1f8c67b17c9d2cc331a
tree: b76b1d615d26a1e4ab8ef313ddb525e8440f520a
  1. service/
  2. tests/