Prompt for fbstream STUN server during build

Change-Id: I50b8dc3bb46d7d0e88f7da7bf67e7e63a198a331
Updated to support EventServer conversion to Android Service

init.rc now creates the sensors socket under the net_admin user so it can be
accessed by an app with the NET_ADMIN system permission.
init.rc now does not attempt to start the EventServer, which is now an Android Service that starts
on boot.
LocationHelper now starts on SVMP boot message, not system boot message.

Change-Id: I66076cf3a729bebbf705b4ca53c1268f75f905ba
Collapsed LocationHelper into EventServer

Removed LocationHelper app completely.
Now the EventServer is an Android service, it can communicate directly with
the LocationManager using Intent broadcasts.

Change-Id: Ib9201733c9d4cb00d93a5f98414fc6307c5e4760