Code review comment for lp:~doanac/utah/uuid_check_rsyslog

I've read that $() is better than `` for portability, but we do appear to be using `` in other spots in the code, so it's obviously not breaking anything right now.

I have two more substantive concerns. Are we going to receive a UUID on systems where the wait_for_booted isn't working? Is it safe to change the incorrect uuid behavior from an Exception to logging an error? The intent of this check is to ensure we're actually running on the system we installed, and I don't think logging an error and then continuing the test is necessarily an appropriate response. We could consider doing a retry, but I think continuing is a problem.