[users at bb.net] Gitlab, MRs, and try builds, oh my

[Dan Kegel]

Ok, submitted https://github.com/buildbot/buildbot/pull/4097 to sort the
spurious builds on e.g. closing a merge request.

Now on to making merge requests not require  configuring the scheduler to
listen for changes from all possible 'source' branches.

I see buildbot uses magic in its GitHib changesource, that seems related.
And buildbot has special support in Changesets for patches, so traditional
try builds don't have to worry about this.

Has anybody thought about how to get the same result with gitlab?  Or am I
missing something?

Seems like we want the generated Changesets to be routed to
singleBranchSchedulers based on target project/branch, but then sneakily
have the source from the MR's source project/branch.
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