Relay pubsub iq queries to muc members without using bare jid

We do something similar for vcard queries, this allows target server
to respond to those queries by target server, which is what we want to
do in both of those cases.

src/mod_muc_room.erl

@@ -671,6 +671,10 @@ normal_state({route, ToNick,
 			    ejabberd_router:route_iq(
 			      xmpp:set_from_to(Packet, FromJID, jid:remove_resource(To)),
 			      Packet, self());
+			pubsub ->
+			    ejabberd_router:route_iq(
+				xmpp:set_from_to(Packet, FromJID, jid:remove_resource(To)),
+				Packet, self());
 			ping when ToNick == FromNick ->
 			    %% Self-ping optimization from XEP-0410
 			    ejabberd_router:route(xmpp:make_iq_result(Packet));
@@ -1304,12 +1308,13 @@ process_voice_approval(From, Pkt, VoiceApproval, StateData) ->
 	    StateData
     end.
 
--spec direct_iq_type(iq()) -> vcard | ping | request | response | stanza_error().
+-spec direct_iq_type(iq()) -> vcard | ping | request | response | pubsub | stanza_error().
 direct_iq_type(#iq{type = T, sub_els = SubEls, lang = Lang}) when T == get; T == set ->
     case SubEls of
 	[El] ->
 	    case xmpp:get_ns(El) of
 		?NS_VCARD when T == get -> vcard;
+		?NS_PUBSUB when T == get -> pubsub;
 		?NS_PING when T == get -> ping;
 		_ -> request
 	    end;