Fix flake8 E251 unexpected spaces around keyword / parameter equals

Fixed automatically with autopep8:

  git ls-files | grep py$ | xargs autopep8 --in-place --select E251

Change-Id: I58009e1c8c91c39745d559ac919be331d4cd9e77
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/254598


Tested-by: David Pursehouse <dpursehouse@collab.net>
Reviewed-by: Mike Frysinger <vapier@google.com>