subtests...tag: Fix test behavior

*  Test fails if base image doesn't exist.  Added a docker
   pull, failing with TestNAError if pull fails.
*  It was undefined whether or not upper-case names would
   be created or not.
*  Used existing 'gen_lower_only' config option to guarantee
   either all lower-case, or some upper case will appear.

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

*  Bug https://bugzilla.redhat.com/show_bug.cgi?id=1092773
   opened about key naming inconsistency.
*  Note added to config w/ failing key example
*  Fixed sub_stuff typo in code

Signed-off-by: Chris Evich <cevich@redhat.com>
subtests...pull: Don't test deprecated --tag

Signed-off-by: Chris Evich <cevich@redhat.com>
Merge pull request #191 from cevich/all_shall_pass

Tag + Inspect test bug fixes