Enable rabbitmq_management plugin

Enable the RabbitMQ managment plugin. RabbitMQ managment
will listen on localhost (127.0.0.1) only.

NOTE: This depend on this upstream change:
  voxpupuli/puppet-rabbitmq#777

Also to optimize for performance:
 - Disables message rates in the management plugin.
 - Raises the collect_statistics_interval from 5000ms to
   30000ms.

NB: Cherry-pick was not clean so I tested this manually on queens
and got the expected result:
~]# pcs status |grep -e 'rabbitmq.*Started'
  rabbitmq-bundle-0    (ocf::heartbeat:rabbitmq-cluster):      Started controller-0
  rabbitmq-bundle-1    (ocf::heartbeat:rabbitmq-cluster):      Started controller-1
  rabbitmq-bundle-2    (ocf::heartbeat:rabbitmq-cluster):      Started controller-2

~]# curl -sS  -u guest:$(hiera -c /etc/puppet/hiera.yaml rabbitmq::default_pass) http://127.0.0.1:15672/api/queues/ 2> /dev/null  |jq . |head -n5
[
  {
    "memory": 10936,
    "idle_since": "2019-08-08 8:49:23",
    "consumer_utilisation": null,

Related-Bug: #1815675
Change-Id: I5e73660e23fef15d1cae4c89d8b45b2456b0a110
(cherry-picked from commit d6727af

puppet/services/rabbitmq.yaml

@@ -156,6 +156,12 @@ outputs:
             # TODO(jaosorior): Remove this once we set a proper default in
             # puppet-tripleo
             tripleo::profile::base::rabbitmq::enable_internal_tls: {get_param: EnableInternalTLS}
+            rabbitmq::collect_statistics_interval: 30000
+            rabbitmq::management_enable: true
+            rabbitmq::use_config_file_for_plugins: true
+            rabbitmq::management_ip_address: 127.0.0.1
+            rabbitmq::config_management_variables:
+              rates_mode: none
           -
             if:
             - internal_tls_enabled

releasenotes/notes/rabbitmq-enable-management-plugin-94b27747e4f5e685.yaml

@@ -0,0 +1,6 @@
+---
+features:
+  - |
+    The RabbitMQ management plugin (``rabbitmq_management``) is now enabled.
+    By default RabbitMQ managment is available on port 15672 on the localhost
+    (``127.0.0.1``) interface.