Also explicitly hold ACCESS_WIFI_STATE permission to avoid
no permission problem when using WifiManager#getScanResults
without shell identity.
Fix: 169219565
Test: "atest CtsTetheringTest" in cuttlefish and phyical device
Change-Id: I3d8fa7e8882bf96f61f3316a70efdf991addbcb2
Initial CTS test for tethering.
This change test startTethering/stopTethering and check
status of TETHER_STATE_CHANGE intent.
Bug: 145490751
Test: atest CtsTetheringTest
Change-Id: Ia1ae3b6c2b68b009ca4deef840945186d472d99e