Remove .gitreview file
requested to merge ebernhardson/schemas-event-primary:work/ebernhardson/remove-gitreview into master
This repo is no longer hosted with gerrit, remove the .gitreview
file. This doesn't have a significant effect, mostly a cleanup.
It means when a developer types git review in a repo not hosted
by gerrit the error will be 'No .gitreview file found' rather
than an error trying to write to a read-only repo in gerrit, and
the gerrit commit hooks will not be auto-installed under the
same circumstances.