[automerger] RESTRICT AUTOMERGE: WifiServiceImpl: fix and add tethering checks am: 38598d8d32 am: 8e4b6ba3c3 am: 5a9d8f6c08 am: 54035f7af6

Change-Id: I0d148dd4c6abd38914e23cf195a7d2a6f41a188a
tree: f5733ff0cc49ef24e4cb4072575d46e5464fc19f
  1. service/
  2. tests/