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

Change-Id: I1456e7e2d2a1f3e143c084e1410dd31c505793ad
add --headless mode

Change-Id: I6338ed1d093a8db20250bd060cf97896db268976
more headless fixes

Change-Id: I25243f67b8bcbef41867497b442d1b7f38f638dd
Remove "fix permissions" option
Add power off & reboot to bootloader mode in advanced menu