Support for github commit status

Github reporter sets commit status of pull request based on the result
of the pipeline.

Change-Id: Id95bf0dbaa710c555e3a1838d3430e18ac9501aa
Co-Authored-By: Jesse Keating <omgjlk@us.ibm.com>
diff --git a/tests/fixtures/zuul-github-driver.conf b/tests/fixtures/zuul-github-driver.conf
index b4a85f7..58c7cd5 100644
--- a/tests/fixtures/zuul-github-driver.conf
+++ b/tests/fixtures/zuul-github-driver.conf
@@ -3,6 +3,7 @@
 
 [zuul]
 job_name_in_report=true
+status_url=http://zuul.example.com/status
 
 [merger]
 git_dir=/tmp/zuul-test/git