Set ansible_python_interpreter for bridge.o.o

We don't have python2 on bridge.o.o, force python3.

Change-Id: Ie8eb68007c0854329cf3757e577ebcbfd40ed8aa
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

playbooks/zuul/run-production-playbook.yaml

@@ -3,6 +3,7 @@
     - name: Add bridge.o.o to inventory
       add_host:
         name: bridge.openstack.org
+        ansible_python_interpreter: python3
         ansible_user: zuulcd
 
 - hosts: localhost