I spent some time this afternoon with @mohanboddu and @adamwill
investigating use of greenwave for gating rawhide composes.

https://infrastructure.fedoraproject.org/cgit/ansible.git/commit/?id=f693b6de0d6566881adc189404176edb0bef6121

One thing we ran into was that the requirements for a rawhide compose
can't be expressed only in terms of testcase names. They must be
specified in terms of both the testcase name and the scenario.

This patch gives greenwave the ability to do that. A passing
testcaserule now optionally allows also specifying a required scenario
for that testcase.

I don't yet have a full list of testcase X scenario combinations, but
when I have one, I'll commit it to ansible.