run_pylint: Quiet irrelevant / false-positives messages

Signed-off-by: Chris Evich <cevich@redhat.com>
dockertest: Fix some TODO's

*  Some could just be removed
*  Added a new verify_output attribute to the
   CLI classes of images/containers
*  Made just the high-level methods pass
   result through OutputGood when enabled.

Signed-off-by: Chris Evich <cevich@redhat.com>
envchecks: Pythonify non-default-images

Signed-off-by: Chris Evich <cevich@redhat.com>