Streams: XADD, handle signaling of write in different ways.

src/t_stream.c

@@ -2019,6 +2019,9 @@ void xdelCommand(client *c) {
         streamParseIDOrReply(c,c->argv[j],&id,0); /* Retval already checked. */
         deleted += streamDeleteItem(s,&id);
     }
+    signalModifiedKey(c->db,c->argv[1]);
+    notifyKeyspaceEvent(NOTIFY_STREAM,"xdel",c->argv[1],c->db->id);
+    server.dirty += deleted;
     addReplyLongLong(c,deleted);
 }
 /* XINFO CONSUMERS key group