py3: backout changeset
56635c506608 which wrongly added couple of b''
I am not sure what I was thinking when I added that but while fixing rebase
tests, I revisited the file and found that I did wrong. I am sorry for this.
Differential Revision: https://phab.mercurial-scm.org/D2504
py3: add a missing b'' in tests/bruterebase.py
Differential Revision: https://phab.mercurial-scm.org/D2503