bodhi: Only define consumer config for consumers.

Only hosts that have bodhi_message_routing_keys defined are
message consumers, so let's only define the fedora-messaging
consumer config settings if that variable is defined.

Signed-off-by: Randy Barlow <randy@electronsweatshop.com>

roles/bodhi2/base/templates/fedora-messaging.toml.j2

@@ -9,7 +9,6 @@ topic_prefix = "org.fedoraproject.prod"
 publish_exchange = "amq.topic"
 passive_declares = false
 
-callback = "bodhi.server.consumers:messaging_callback"
 
 
 [tls]
@@ -22,6 +21,9 @@ certfile = "/etc/fedora-messaging/bodhi-cert.pem"
 app = "bodhi"
 
 
+## If bodhi_message_routing_keys is defined, this must be a consumer so let's also set up the consumer
+## config.
+{% if bodhi_message_routing_keys %}
 [queues."bodhi{{ env_suffix }}"]
 durable = true
 auto_delete = false
@@ -38,6 +40,8 @@ routing_keys = [
 {% endfor %}
 ]
 
+callback = "bodhi.server.consumers:messaging_callback"
+
 
 [log_config]
 version = 1
@@ -105,3 +109,6 @@ handlers = ["console", "email"]
 [log_config.root]
 level = "ERROR"
 handlers = ["console", "email"]
+
+## End consumer config if statement
+{% endif %}