Add fas tests that actually cover current messages.
Add fas tests that actually cover current messages.

And mark old tests as 'legacy2' since we already have some other legacy
tests in there.

This should fix #168.

opoplawski/fedmsg_meta_fedora_infrastructure,fedora-infra/fedmsg_meta_fedora_infrastructure,Ghost-script/fedmsg_meta_fedora_infrastructure,sayanchowdhury/fedmsg_meta_fedora_infrastructure