fix: enable self signed jwt for grpc#53

gcf-merge-on-green[bot] merged 2 commits intomastergoogleapis/python-appengine-admin:masterfrom

owl-bot-5a206eb6-4b4e-4e19-be11-4832478b3995googleapis/python-appengine-admin:owl-bot-5a206eb6-4b4e-4e19-be11-4832478b3995Copy head branch name to clipboard