Add option to dev_debug_vboot to clean up after running

Also provide a bit more output, stop and tell us if it's not running on a
Chrome OS BIOS.

Change-Id: I0e6a5680ec050b3f4d0a5c7adc87ca2441ba6d06


From a root shell, run "dev_debug_vboot --cleanup", then look in
/tmp/dev_debug/. You should see only the file noisy.log

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