Commit
68b83cd3f62619f764642f5aab491415d3065051
by Oliver Smithdeps/update: don't fetch repos where COMMIT exists
Instead of unconditionally fetching each git repository, check if the
commit we want to checkout already exists in the git repository. If that
is the case, then don't fetch it.
Related: OS#6572
Change-Id: I342957668892e7d29666fada82362cb4a6c7aac5