de34db3ee36b0c201bab702ef11b62b0413593fd

Having a CommandFailed exception without stdout is very confusing, lets fix that. subprocess.CalledProcessError doesn't print out stderr or stdout so use our own error that does. Change-Id: I3bf75d6f526bdc58e64bbc7d83911e9d63e4b801
Description
RETIRED, further work has moved to Debian project infrastructure