In the spirit of nacltest.bash and androidtest.bash. Sets up the
exec script and reboots the device.

The reboot helps make sure previous runs do not interfere with the
current run. It is reasonably easy for a bad program, e.g. one with
a corrupt stack, to get the device stuck.

Change-Id: I61317527741c45a70c390fe21adc4895510fc79f
Reviewed-on: https://go-review.googlesource.com/8242Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>