OpenDev is working on upgrading from Gerrit 3.10 to 3.11, so let's
make sure git-review is working correctly with it.
To make this work we need to avoid directly pushing commits to
refs/heads/master (and other branches) as Gerrit 3.11 now requires
everything go through code review by default (even when you are the
Administrator). Update some setup code to push baseline commits as
changes that we immediately submit instead of pushing the commits
directly.
Finally, there are two test cases that were pushing directly to create
commits and branches. Update those pushes similarly to the setup code.
We push changes that submit them and create branches via the api.
Change-Id: Ibe621dc10f8886d6a907bd2667dc8c494ca46aab
ce8e28b1f0