Make Superuser work.

Change-Id: Ib4d452094753458276f577dfc36b936c6888bcc0
enable developer options visibility by default for userdebug builds

Signed-off-by: Roman Birg <romanbirg@gmail.com>
Settings: Removed system update option

Removed system update from Settings>About phone

Change-Id: If3aab16b6877736dadafdac0a2cd46afe56d80f7
Signed-off-by: Arham Jamal <arhamjamal@gmail.com>
Settings: use DefaultContainerService for all file operations

For devices with non-emulated storage, the system uid is not allowed
to access the storage (to prevent system_server from being killed
on UMS mount). Old code remain that make file access directly, change
those to use DefaultContainerService

Depends on http://review.cyanogenmod.org/28179

Change-Id: Ie6bdaf27249daeabdc7f0ef1d73d484764ee35f0

Conflicts:
	src/com/android/settings/deviceinfo/MiscFilesHandler.java