use upper case for all positional args

Signed-off-by: Richard Marko <rmarko@fedoraproject.org>
releasemod returns 1 on missing release

Signed-off-by: Richard Marko <rmarko@fedoraproject.org>
tests: add call_action to test harness

Signed-off-by: Richard Marko <rmarko@fedoraproject.org>
tests: rewrite actions test to use call_action

Signed-off-by: Richard Marko <rmarko@fedoraproject.org>