Cluster: react faster when a slave wins an election.

src/redis.c

@@ -1203,6 +1203,9 @@ void beforeSleep(struct aeEventLoop *eventLoop) {
 
     /* Write the AOF buffer on disk */
     flushAppendOnlyFile(0);
+
+    /* Call the Redis Cluster before sleep function. */
+    if (server.cluster_enabled) clusterBeforeSleep();
 }
 
 /* =========================== Server initialization ======================== */