Reorganize migrate constaints check and add unit tests #1362
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Description
Changes proposed in this pull request:
After I found out an issue on 1.8.0-rc.1, I've reorganized the code a bit and also wrote some unit tests to check how it behaves.
Unfortunately this is a known issue Masterminds/semver#177, but as we can encounter it only on RC versions, I think it's a very low priority one.
This PR doesn't need to be cherry-picked for final 1.8.
Testing
See test instruction from #1353