[1/2] Speed up booting on multicore devices.

1. Add multithreading support to Installer/installd.
2. Parallelize package scanning.
3. Parallelize boot dexopt.

Change-Id: Id42b2bf4a737f93f9ecd9b5819344adbb735f0fb

Conflicts:

	services/java/com/android/server/pm/PackageManagerService.java
4.4 implementation of active display

Change-Id: I08330a28d0880f82c09ccaec7e36844d9e6570d5

Conflicts:
	core/res/AndroidManifest.xml
	packages/SystemUI/AndroidManifest.xml
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java