Use rabbitmq ipv6 flag

The internal details of enabling IPv6 have moved upstream[1], so just
set the ipv6 flag when desired and don't worry about the details
anymore!

[1] https://github.com/puppetlabs/puppetlabs-rabbitmq/pull/552

Closes-Bug: #1710658

Change-Id: Ib22507c4d02f0fae5c0189ab7e040efac3df7e2f
(cherry picked from commit 3a5eb08d58)

manifests/profile/base/rabbitmq.pp

@@ -72,15 +72,6 @@ class tripleo::profile::base::rabbitmq (
   $stack_action        = hiera('stack_action'),
   $step                = hiera('step'),
 ) {
-  # IPv6 environment, necessary for RabbitMQ.
-  if $ipv6 {
-    $rabbit_env = merge($environment, {
-      'RABBITMQ_SERVER_START_ARGS' => '"-proto_dist inet6_tcp"',
-      'RABBITMQ_CTL_ERL_ARGS' => '"-proto_dist inet6_tcp"'
-    })
-  } else {
-    $rabbit_env = $environment
-  }
   if $inet_dist_interface {
     $real_kernel_variables = merge(
       $kernel_variables,
@@ -99,7 +90,8 @@ class tripleo::profile::base::rabbitmq (
         cluster_nodes           => $nodes,
         config_kernel_variables => $real_kernel_variables,
         config_variables        => $config_variables,
-        environment_variables   => $rabbit_env,
+        environment_variables   => $environment,
+        ipv6                    => $ipv6,
       }
       # when running multi-nodes without Pacemaker
       if $manage_service {
@@ -115,7 +107,8 @@ class tripleo::profile::base::rabbitmq (
       class { '::rabbitmq':
         config_kernel_variables => $kernel_variables,
         config_variables        => $config_variables,
-        environment_variables   => $rabbit_env,
+        environment_variables   => $environment,
+        ipv6                    => $ipv6,
       }
     }
   }