backup service: fall back to /sbin/bu

Change-Id: I46c67a401da8de92d7ef81ad40c565bb1d2ef93b
init: allow media to set persist.camera property

Change-Id: Ife28c39da107b53b9c497be9fcbad3159031b8fe
Merge remote-tracking branch 'cm/cm-10.1' into cm-10.1-linaro