Configurable SSH access to GitHub

Change-Id: I2ad5b17991d25ec7492d931c069cbcf314dba804
diff --git a/tests/fixtures/zuul-github-driver.conf b/tests/fixtures/zuul-github-driver.conf
index b979a3f..b4a85f7 100644
--- a/tests/fixtures/zuul-github-driver.conf
+++ b/tests/fixtures/zuul-github-driver.conf
@@ -15,3 +15,7 @@
 
 [connection github]
 driver=github
+
+[connection github_ssh]
+driver=github
+sshkey=/home/zuul/.ssh/id_rsa