Changes

test-override: combine metal/metal4k/live into single call

With `cosa osbuild` we can now do this in one go.

bodhi-trigger: add link for viewing topic messages

Having a link handy where you can see actual messages always makes
understanding how they are processed easier.

lower resultsdb reporting into test-override job

This way one can easily replay ↺ a job to retry a failed test
and still have the results reported back to Bodhi.

This also means we don't need to hold open the bodhi-trigger
job while the test-override jobs runs, which means more slots
are available in jenkins to run other tests.

Should resolve https://github.com/coreos/coreos-ci/issues/64

limit build description to RPMs we care about

This way we won't get a huge list of RPMs in the messages when people
submit large updates. We'll only get listed out the RPMs that we are
tracking in CoreOS.