fix blocker problem (#2244)

* fix blocker problem

* use error level to log exception

dolphinscheduler-remote/src/main/java/org/apache/dolphinscheduler/remote/NettyRemotingClient.java

@@ -301,7 +301,7 @@ public class NettyRemotingClient {
                 return channel;
             }
         } catch (Exception ex) {
-            logger.info("connect to {} error  {}", address, ex);
+            logger.error("connect to {} error", address, ex);
         }
         return null;
     }

dolphinscheduler-remote/src/main/java/org/apache/dolphinscheduler/remote/handler/NettyServerHandler.java

@@ -117,7 +117,7 @@ public class NettyServerHandler extends ChannelInboundHandlerAdapter {
                     try {
                         pair.getLeft().process(channel, msg);
                     } catch (Throwable ex) {
-                        logger.error("process msg {} error : {}", msg, ex);
+                        logger.error("process msg {} error", msg, ex);
                     }
                 }
             };