Tenderloin: Fix for reboot into recovery

Added in a service to start as root on reboot into recovery. Added
logging into rebootcmd.  Converted moboot_control to use sh
instead of bash.

Change-Id: I8595eada20a1b1947434ab26453fd1adc54c56be
Merge "Tenderloin: Fix for reboot into recovery" into jellybean-4.3