Test: rerun robotests Change-Id: I7054d8d5cfc4756beb8d3032bc92361534229494
1.Add a button to launch QR code scanner when add a network. 2.Scan button added in AddNetworkFragment / WifiDialog / WifiSettings. Bug: 120630683 Test: make RunSettingsRoboTests Change-Id: I340bfa2247e092f586dd90dfea37c355e681ffee