Cleanup void tcp options

After Ranch (socket acceptor pool) has come into effect
the following tcp listen options is no longer valid:
  - binary, packet, reuseaddr.

For details:
rabbitmq/rabbitmq-server#260

manifests/config.pp

@@ -67,6 +67,10 @@
   # Handle env variables.
   $environment_variables = merge($default_env_variables, $rabbitmq::environment_variables)
 
+  # Get ranch (socket acceptor pool) availability,
+  # use init class variable for that since version from the fact comes too late.
+  $ranch = versioncmp($rabbitmq::version, '3.6') >= 0
+
   file { '/etc/rabbitmq':
     ensure => directory,
     owner  => '0',

templates/rabbitmq.config.erb

@@ -17,17 +17,19 @@
     {cluster_nodes, {[<%= @cluster_nodes.map { |n| "\'rabbit@#{n}\'" }.join(', ') %>], <%= @cluster_node_type %>}},
     {cluster_partition_handling, <%= @cluster_partition_handling %>},
 <% end -%>
-    {tcp_listen_options,
-         [binary,
+    {tcp_listen_options, [
+         <%- unless @ranch -%>
+         binary,
+         {packet,        raw},
+         {reuseaddr,     true},
+         <%- end -%>
          <%- if @tcp_keepalive -%>
          {keepalive,     true},
          <%- end -%>
-         {packet,        raw},
-         {reuseaddr,     true},
          {backlog,       128},
          {nodelay,       true},
-         {exit_on_close, false}]
-    },
+         {exit_on_close, false}
+    ]},
 <%- if @ssl_only -%>
     {tcp_listeners, []},
 <%- elsif @interface != 'UNSET' -%>