Production deployments of global-jjb should be using the GitHub mirror
as their primary source as GitHub rarely has outages. This decouples the
master Gerrit instance from downstream consumption such that we are more
free to do maintenance whenever we desire.
Change-Id: I37139965902fa922cbb14f7ad01c22248bc1847b Signed-off-by: Andrew Grimberg <agrimberg@linuxfoundation.org>