Comment 1 for bug 1731554

note the intention here is to *not* break the hash abi. There are two changes that do, but they are actually unrelated (I need to clean up my MP, but ENOTIME): 1) branch name in the commit messages (this gets dropped, becuse the import functions no longer know about the branches) and 2) once we decide in the spec how to handle the order of import tag creation (e.g., if something is actually published in ubuntu before debian, we might naively expect the ubuntu one to be import and the debian one to be reimport, but that's not how the code works currently).

I thikn another big speedup can probably be done by doing the applied import right after the unapplied.