Move seinfo and install-time changes to inside PMS.

Per request by Google, move the install-time checks entirely
inside PMS.

Change-Id: I01f2a9084dfe7886087b1497070b0d7f2ad8479e

Conflicts:
	core/tests/coretests/apks/mmac_install_platform_2/src/com/android/frameworks/corestest/DoNothing.java
	core/tests/coretests/apks/mmac_install_platform_2/src/com/android/frameworks/coretests/DoNothing.java
	services/java/com/android/server/DevicePolicyManagerService.java
	services/java/com/android/server/pm/PackageManagerService.java
	services/tests/servicestests/apks/mmac_install_media/src/com/android/frameworks/servicestests/DoNothing.java