Fixed a leaked partial wakelock in AbstractThreadedSyncAdapter.

This fix ensures that onFinished() is always called in a syncClient
even if the application lacks the READ_SYNC_SETTINGS permission.

Change-Id: I944717e71ceae06a665f8a3b1199b41d73e12da4
Update preloaded-classes

Change-Id: I42247e498ad532e3f4699bc87c0d314cde74e3f6
 Set foreground priority for shutdown receivers.

The broadcast of ACTION_SHUTDOWN has a timeout of 10 seconds. To
reduce the risk of hitting the timeout and speeding up the
shutdown sequence in ShutdownThread we set the priority of the
BroadcastReceivers to FLAG_RECEIVER_FOREGROUND.

We have seen that this change reduces the shutdown time when
the system is under heavy load.
Improve tethering notification icons

Replaces the stock icons with the ones I submitted as part of
http://review.cyanogenmod.com/#/c/15930/ in CM9.

Change-Id: Iecfae9ad579c6c9ae06da0a08b61e9359a8a37b0