Ping on unlock changes

 * Stop message flip animation on unlock
 * Prevent ping spam on unlock -
    - Ping ONLY if NEW notification received while device is locked/screen is off
      (If a notification pinged HALO once but was ignored, it will not ping again unless updated)

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/halo/Halo.java

Change-Id: Ic5cdb9a148dd0bedcda7072bc3037eb2ad61f043