Add ability to check if specified passwords match RabbitMQ DB and change if required

Renames the exec statement for fetching gpg key to be more descriptive.
Checks to make specified user passwords match configured passwords in RabbitMQ and resets if needed.
That's actually old code, the only thing I did war rename the exec so that adding dependencies on it would be easier since outside modules might not know the URL. I've never used yumrepo to import/download gpg keys so I can't comment on that.