Promote slaves only for actual cluster members when forgetting cluster nodes

Ensures that newly forgotten nodes are not selected for promotion,
otherwise restarted slaves might not be able to bring up the queues.

rabbitmq-server#1213
[#145084865]

Author: dcorbacho

src/rabbit_amqqueue.erl

@@ -866,8 +866,10 @@ forget_node_for_queue(DeadNode, [H|T], Q) ->
 node_permits_offline_promotion(Node) ->
     case node() of
         Node -> not rabbit:is_running(); %% [1]
-        _    -> Running = rabbit_mnesia:cluster_nodes(running),
-                not lists:member(Node, Running) %% [2]
+        _    -> All = rabbit_mnesia:cluster_nodes(all),
+                Running = rabbit_mnesia:cluster_nodes(running),
+                lists:member(Node, All) andalso
+                    not lists:member(Node, Running) %% [2]
     end.
 %% [1] In this case if we are a real running node (i.e. rabbitmqctl
 %% has RPCed into us) then we cannot allow promotion. If on the other