Add connectivity manager automation test framework:

 - Create a dummy activity - ConnectivityManagerTestActivity - to listen to broadcast from connectivity manager, to control wifi, and to verify that connectivity information for different network types. This framework will be used for funcitonal tests and stress tests.

 - Add two functional test cases:
   . test3GToWifiNotification: test enabling Wifi without associating with any access point, Wifi stays disconnected, device should still connect to cellular.
   . testConnectToWifi: when switching from cellular to Wfi and associated with a given AP, connectivity manager broadcast the right informtion for mobile and Wifi.

Change-Id: Ib6fcf0ff6dd9725076836032e567c0a6a52f622f