Update all tests: Best effort, work by default.

Update all tests that require option customization
to work out of the box, but utilize the new (special)
__warning__ option to document recommended config.
customizations were **not** made.

Signed-off-by: Chris Evich <cevich@redhat.com>
Rename __warning__ to __example__

While a warning will be issued, it's not really the subject matter
for this option-name.  Renamed all references and use of the former
__warning__ option, to __example__ instead.  All behavior remains
unchanged.

Signed-off-by: Chris Evich <cevich@redhat.com>
run_remote_tag: Exception message fixup

Signed-off-by: Chris Evich <cevich@redhat.com>
Fix unittests + DEFAULTS not filtering __example__

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