Resolve "ee-specific-lines-check should take the old base one commit before the one we want"
What does this MR do?
Make ee-specific-lines-check take the old base one commit before the one we want
Why was this MR needed?
This was explained in https://content.pivotal.io/blog/git-rebase-onto
Previously I was not passing old base as a merge-base because the result is the same. But if we want to pass a commit before it, then that's quite different and we need merge-base to find the old base we really want.
Does this MR meet the acceptance criteria?
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Tests added for this feature/bug - Review
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Has been reviewed by Backend
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What are the relevant issue numbers?
Closes #5923 (closed)