Make SocksServer example compatible with curl --socks5-hostname

Motivation:

Socks5 proxy supports resolve domain at the server side. When testing
with curl, the SocksServer in example package only works for proxy
request with IP, not with domain name (`--socks5` vs
`--socks5-hostname`). As curl is widely used, it should work with
the example provided.

Modifications:

Passing address and port to the Socks5CommandResponse, so that it
works for curl.

Result:

`curl --socks5-hostname` works as expected.

example/src/main/java/io/netty/example/socksproxy/SocksServerConnectHandler.java

@@ -102,7 +102,10 @@ public final class SocksServerConnectHandler extends SimpleChannelInboundHandler
                             if (future.isSuccess()) {
                                 ChannelFuture responseFuture =
                                         ctx.channel().writeAndFlush(new DefaultSocks5CommandResponse(
-                                                Socks5CommandStatus.SUCCESS, request.dstAddrType()));
+                                                Socks5CommandStatus.SUCCESS,
+                                                request.dstAddrType(),
+                                                request.dstAddr(),
+                                                request.dstPort()));
 
                                 responseFuture.addListener(new ChannelFutureListener() {
                                     @Override