cLock: Force a location update when lastKnownLocation = null

If lastKnownLocation is not present because none of the apps in the
device has requested the current location to the system yet,
then try to get the current location use an non-accuracy/network
provider.

Patchset 2: Remember the location listener to not queue up multiple requests
Patchset 3: Untie listener instance from (short-lived) service instance
Patchset 4: Cleanup

Change-Id: I86712145562f361115944d1b801ed139991000a4
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>
cLock: Check NETWORK_PROVIDER before call requestSingleUpdate

Check whether the NETWORK_PROVIDER location provider is supported before
call requestSingleUpdate to avoid "null provider" exception.

Change-Id: I3be2648565a51f8592d7278ac67f70d239e37494
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>
LockClock: Add default clock app detection

Change-Id: Ib6bfbb5de765c1e3a0c81a1849343f24b3616e95

Conflicts:
	AndroidManifest.xml