Turn the log to TRACE

Author: jfarcand

src/main/java/com/ning/http/client/providers/netty/NettyAsyncHttpProvider.java

@@ -252,7 +252,7 @@ public NettyAsyncHttpProvider(AsyncHttpClientConfig config) {
                     e = Executors.newCachedThreadPool();
                 }
                 int numWorkers = config.getIoThreadMultiplier() * Runtime.getRuntime().availableProcessors();
-                log.debug("Number of application's worker threads is {}", numWorkers);
+                log.trace("Number of application's worker threads is {}", numWorkers);
                 socketChannelFactory = new NioClientSocketChannelFactory(e, config.executorService(), numWorkers);
                 allowReleaseSocketChannelFactory = true;
             }