Add octbr bridge (#44)

Missing octbr breaks worker to amphora-vm communication and leads to all
job failures. Adding the same.

Author: links84

ansible/roles/values-prep/templates/service_values.yaml.j2

@@ -32,7 +32,7 @@ data:
     ovnController:
       external-ids:
         enable-chassis-as-gateway: true
-        ovn-bridge: br-int
+        ovn-bridge: octbr
         ovn-encap-type: geneve
         system-id: random
       networkAttachment: tenant