Fixes#203.
The modulemd files we had used to all pin the commit hashes of the
components they were pulling in. We changed this with modulemd-1.0 and
now modules can define their components in terms of their *stream*
(a.k.a. their dist-git *branch*). This is awesome, and is a big
stepping stone towards greater things.
The problem is that we used to take that git ref literally from the
modulemd and pass it on to koji. Now that instead we are passing on a
branch name to koji, it falls down. Koji requires us to send it an
explicit commit hash.
This change takes that branch name and converts it to an explicit commit
hash when the module is first submitted.
Verified that things are working again:
- http://koji.stg.fedoraproject.org/koji/taskinfo?taskID=90084980
