greenwave: use fedmsg-hub-3 instead of fedmsg-hub as the entrypoint

Greenwave 0.8+ has switched to Python 3, which means the fedmsg-hub
command for the fedmsg-consumers pod has to be fedmsg-hub-3 now.

This is in staging only for now.

playbooks/openshift-apps/greenwave.yml

@@ -71,7 +71,7 @@
     objectname: route.yml
   - role: openshift/object
     app: greenwave
-    file: deploymentconfig.yml
+    template: deploymentconfig.yml
     objectname: deploymentconfig.yml
   - role: openshift/rollout
     app: greenwave

roles/openshift-apps/greenwave/templates/deploymentconfig.yml

@@ -80,7 +80,11 @@ spec:
         ports:
         - containerPort: 8081
         command:
+{% if env == 'staging' %}
+        - '/usr/bin/fedmsg-hub-3'
+{% else %}
         - '/usr/bin/fedmsg-hub'
+{% endif %}
         volumeMounts:
         - name: config-volume
           mountPath: /etc/greenwave