Set cgit url in zuul connection config

Zuul defaults to using Gerrit's built in gitweb for sha1 web urls. We
disabled gitweb on our Gerrit and have it pointing at cgit. Update Zuul
to use these URLs instead.

Change-Id: If02e48759726ea98ce61fab3f1bcb9526d61b90f
Depends-On: I91d77e309cfeea0e90a85f926aca9b8c347b0385

hiera/fqdn/zuulv3.openstack.org.yaml

@@ -13,6 +13,7 @@ zuul_connections:
     canonical_hostname: 'git.openstack.org'
     user: 'zuul'
     sshkey: '/var/lib/zuul/ssh/id_rsa'
+    gitweb_url_template: 'https://git.openstack.org/cgit/{project.name}/commit/?id={sha}'
 
   - name: 'mysql'
     driver: 'sql'