Use git.openstack.org everywhere

Our official git master is at git.openstack.org, update places
that use github instead.

Change-Id: Idf745ced59028dbada05acf7ae0be05e967a999d
diff --git a/doc/source/launchers.rst b/doc/source/launchers.rst
index 0a1e0e7..c61cea8 100644
--- a/doc/source/launchers.rst
+++ b/doc/source/launchers.rst
@@ -239,7 +239,7 @@
 instead.  As an example, the OpenStack project uses the following
 script to prepare the workspace for its integration testing:
 
-  https://github.com/openstack-infra/devstack-gate/blob/master/devstack-vm-gate-wrap.sh
+  https://git.openstack.org/cgit/openstack-infra/devstack-gate/tree/devstack-vm-gate-wrap.sh
 
 Turbo Hipster Worker
 ~~~~~~~~~~~~~~~~~~~~