Forcefully close connection when Future is manually cancelled during connect, close AsyncHttpClient#1131

Author: slandelle

client/src/main/java/org/asynchttpclient/netty/channel/NettyConnectListener.java

@@ -69,6 +69,7 @@ private void writeRequest(Channel channel) {
 
         if (future.isDone()) {
             abortChannelPreemption();
+            Channels.silentlyCloseChannel(channel);
             return;
         }