support members info item in classic queues, which will always be the leader

(cherry picked from commit 71f921c)

Author: Ayanda-D

deps/rabbit/src/rabbit_amqqueue_process.erl

@@ -120,7 +120,8 @@
          owner_pid,
          exclusive,
          user_who_performed_action,
-         leader
+         leader,
+         members
         ]).
 
 -define(INFO_KEYS, [pid | ?CREATION_EVENT_KEYS ++ ?STATISTICS_KEYS -- [name, type]]).
@@ -1085,6 +1086,7 @@ i(arguments,   #q{q = Q}) -> amqqueue:get_arguments(Q);
 i(pid, _) ->
     self();
 i(leader, State) -> node(i(pid, State));
+i(members, State) -> [i(leader, State)];
 i(owner_pid, #q{q = Q}) when ?amqqueue_exclusive_owner_is(Q, none) ->
     '';
 i(owner_pid, #q{q = Q}) ->

deps/rabbit/test/classic_queue_SUITE.erl

@@ -83,7 +83,8 @@ leader_locator_client_local(Config) ->
                                       {<<"x-queue-leader-locator">>, longstr, <<"client-local">>}])),
          {ok, Leader0} = rabbit_ct_broker_helpers:rpc(Config, Server, rabbit_amqqueue, lookup, [rabbit_misc:r(<<"/">>, queue, Q)]),
          Leader = amqqueue:qnode(Leader0),
-         ?assertEqual([{leader, Leader}], rabbit_ct_broker_helpers:rpc(Config, Server, rabbit_amqqueue, info, [Leader0, [leader]])),
+         ?assertEqual([{leader, Leader}, {members, [Leader]}],
+            rabbit_ct_broker_helpers:rpc(Config, Server, rabbit_amqqueue, info, [Leader0, [leader, members]])),
          ?assertEqual(Server, Leader),
          ?assertMatch(#'queue.delete_ok'{},
                       amqp_channel:call(Ch, #'queue.delete'{queue = Q}))