Fixes for Superuser

Change-Id: I86a280088ee8767e02ba51b72f4d011cf4658f6f
su installation and detection updates for 4.3

Change-Id: Idce9a6d4ca18ddc9b49029024c26bc114f6d3c15
6035

Change-Id: Iab792171fdbe62fe85ac3084f49cbd38cb172fba