973838: refresh redhat.repo after register

For cases where register potentially attaches pools
(--auto-attach/--activationkey/--consumerid)
run certlib.update and repolib.update so entitlements
certs are pulled, and redhat.repo is refreshed
immediately.
Merge pull request #772 from candlepin/alikins/973838_repo_refresh

973838: refresh redhat.repo after register