Remove deprecated rpc_backend param

Remove the deprecated rpc_backend param which has been deprecated for
two years. The default_transport_url has been present for a while
now and should be used.

Change-Id: I140318c4eaae9aada3e7f6ce904c950a692a06d8

manifests/init.pp

@@ -166,12 +166,6 @@
 #   (Optional) Run db sync on the node.
 #   Defaults to true
 #
-# DEPRECATED PARAMETERS
-#
-# [*rpc_backend*]
-#   (Optional) Use these options to configure the RabbitMQ message system.
-#   Defaults to 'rabbit'
-#
 # == Authors
 #
 #   Dan Radez <dradez@redhat.com>
@@ -216,8 +210,6 @@ class tacker(
   $amqp_username                      = $::os_service_default,
   $amqp_password                      = $::os_service_default,
   $sync_db                            = true,
-  # DEPRECATED PARAMETERS
-  $rpc_backend                        = 'rabbit',
 ) inherits tacker::params {
 
   include ::tacker::deps
@@ -227,10 +219,6 @@ class tacker(
     include ::tacker::db::sync
   }
 
-  if $rpc_backend {
-    warning('The rpc_backend parameter has been deprecated, please use default_transport_url instead.')
-  }
-
   oslo::messaging::rabbit {'tacker_config':
     rabbit_use_ssl              => $rabbit_use_ssl,
     heartbeat_timeout_threshold => $rabbit_heartbeat_timeout_threshold,

releasenotes/notes/remove-deprecated-rabbit-params-21ab0c89b2ef85fc.yaml

@@ -0,0 +1,5 @@
+---
+upgrade:
+  - |
+    The deprecated tacker::rpc_backend is now removed. Please use
+    tacker::default_transport_url instead.