Add logging to show the yum repo definition

We're getting some test failures due to not being able to access
the puppetlabs development yum repo (s3?).  This commit
simply adds logging to show the repo configuration, which should
help us to troubleshoot this kind of error going forward.
Merge pull request #638 from cprice404/bug/burgundy/dev-repo-failure

Add logging to show the yum repo definition