Currently if the compose fails for any reason the final status is always DOOMED. This makes it difficult for gathering metrics, because the failure could be a problem in the package set, or it could be a bug in pungi.

It would be nice to have a separate status to distinguish between these two failure situations. I'm thinking BROKEN_PKGSET, but any better name is welcome.

As a beginning we should use this status in these situations:

• when there are broken dependencies (and check_deps=True) – this is a clear case with no false positives
• when a koji task fails – this could in theory be false positive because there might be an authentication problem, or maybe a bug in calling the command (maybe there is a reasonable way to tell these apart)