<oo-admin-check-sources.py> Only display "re-run" message if problems detected

Added a state-tracking variable `problem` to
`OpenShiftAdminCheckSources` object so that the "Please re-run this
tool..." message can be displayed only when a problem is detected.
Merge pull request #121 from dobbymoodge/check-sources-bugs

<oo-admin-check-sources.py> Only display "re-run" message if problems detected