rebase: extract common _concludenode()
_rebasenode() and _finishrebase() had a lot of code in common. This
commit extracts some of that. This means we will also have a single
caller of concludenode() and concludememorynode(), which gives us a
place to put code that is common between those two functions (which is
quite a bit).
Differential Revision: https://phab.mercurial-scm.org/D2914
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