Add log info in case of enqueuing timeout

Author: acogoluegnes

src/main/java/com/rabbitmq/client/impl/NettyFrameHandlerFactory.java

@@ -324,6 +324,7 @@ public void writeFrame(Frame frame) throws IOException {
             if (canWriteNow) {
               this.doWriteFrame(frame);
             } else {
+              this.handler.logEvents();
               throw new IOException("Frame enqueuing failed");
             }
           } catch (InterruptedException e) {

src/test/resources/logback-test.xml

@@ -8,6 +8,7 @@
     <logger name="com.rabbitmq.client.AmqpClientTestExtension" level="debug" />
     <logger name="com.rabbitmq.client.test.server.TopicPermissions" level="debug" />
     <logger name="com.rabbitmq.client.impl.AbstractMetricsCollector" level="debug" />
+    <logger name="com.rabbitmq.client.impl.NettyFrameHandlerFactory" level="debug" />
 
     <root level="warn">
         <appender-ref ref="STDOUT" />