SELinux: don't suppress the "no file_contexts" message on the UI

Change-Id: I1456e7e2d2a1f3e143c084e1410dd31c505793ad
add --headless mode

Change-Id: I6338ed1d093a8db20250bd060cf97896db268976
Merge "add --headless mode" into cm-10.1
Merge branch 'cm-10.1' of github.com:CyanogenMod/android_bootable_recovery into cm-10.1