Delete sideloaded file once installed

If not deleted, it will be unexpectedly re-installed in case
the user starts and then cancels adb sideload.

Change-Id: Idfea3b5d5c95ab29fd946cd404d1255105105ce3
Rename prebuilt recovery su to su.recovery, so it does not interfere with devices that have a shared recovery/boot.

Change-Id: Id542215a31c4617e230474b65ecf54bbc8117d4e
Merge branch 'cm-10.1' into martincz