Statusbar: dont refresh the signal cluster during panel bar interaction

The signal cluster constantly refreshes below the notification panel.  Lets
return before the updates are processed if we're interacting with the panel bar
to help preserve framerates

PS2: allow updating the quicksetting tiles with a network controller attached
PS3: don't tick notifications

Change-Id: I68c0f21812b3965e41207ab6274368fbadd78349

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/policy/NetworkController.java