Merge "Add a log message if enabling Ethernet tethering if it is already enabled." am: abe9621f7f am: ee5c1678a6 am: e6b8ded812 am: 9bf7e49812 am: 9dd36d01fc

Change-Id: I5d2bbc4fb85d2fa6535dbfc666fba36038a33b2a