REQ-2481: 添加删除日志表的job

im-center-server/src/main/java/cn/axzo/im/send/SendExecutor.java

@@ -52,7 +52,7 @@ public class SendExecutor<T> implements Supplier<ExecResult> {
     public final ExecResult get() {
         long execStart = System.currentTimeMillis();
         while (!sendManager.isInterrupted() && !queue().isEmpty()) {
-            if (!rateLimiter.tryAcquire(1000, TimeUnit.MILLISECONDS)) {
+            if (!rateLimiter.tryAcquire(200, TimeUnit.MILLISECONDS)) {
                 //队列可能被消费完了, 及早退出
                 MiscUtils.sleepQuietly(100, TimeUnit.MILLISECONDS);
                 continue;