Add basic Github Zuul Reporter.

Change-Id: I3c34bb1354adb7c360e173c227f00bf987b7d30e
Co-Authored-By: Jan Hruban <jan.hruban@gooddata.com>
diff --git a/tests/unit/test_github_driver.py b/tests/unit/test_github_driver.py
index 58f456f..430cab3 100644
--- a/tests/unit/test_github_driver.py
+++ b/tests/unit/test_github_driver.py
@@ -50,3 +50,4 @@
         zuulvars = job.parameters['vars']['zuul']
         self.assertEqual(pr.number, zuulvars['change'])
         self.assertEqual(pr.head_sha, zuulvars['patchset'])
+        self.assertEqual(1, len(pr.comments))