Not updating slave acknowledgement time when IOCP operation completes. breaks...

Not updating slave acknowledgement time  when IOCP operation completes. breaks integration/replication-4 unit test.

src/replication.c

@@ -597,6 +597,7 @@ void sendBulkToSlaveDataDone(aeEventLoop *el, int fd, void *privdata, int nwritt
         slave->repldbfd = -1;
         aeDeleteFileEvent(server.el,slave->fd,AE_WRITABLE);
         slave->replstate = REDIS_REPL_ONLINE;
+        slave->repl_ack_time = server.unixtime;
         if (aeCreateFileEvent(server.el, slave->fd, AE_WRITABLE,
             sendReplyToClient, slave) == AE_ERR) {
             freeClient(slave);