haproxy: fix missing user in rabbitmq healthcheck

RabbitMQ HAProxy config was missing user/auth in health checks,
causing backend to be marked DOWN and HTTP 500 errors.

Closes-Bug: #2150569

Change-Id: I1949210687bbe8f896e6b973950ddbea03c1f804
Signed-off-by: Piotr Milewski <vurmil@gmail.com>

Author: vurmil

ansible/group_vars/all/rabbitmq.yml

@@ -5,7 +5,7 @@ enable_rabbitmq: "{{ 'yes' if om_rpc_transport == 'rabbit' or om_notify_transpor
 # RabbitMQ options
 ####################
 rabbitmq_user: "openstack"
-rabbitmq_monitoring_user: ""
+rabbitmq_monitoring_user: "openstack-monitoring"
 # Whether to enable TLS encryption for RabbitMQ client-server communication.
 rabbitmq_enable_tls: false
 # CA certificate bundle in RabbitMQ container.

releasenotes/notes/bug-2150569-0ef77ed404462c35.yaml

@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    Fix RabbitMQ HAProxy config missing auth in health checks.
+    This caused backend to be marked DOWN and HTTP 500 errors.
+    `LP#2150569 <https://launchpad.net/bugs/2150569>`__