don't use full url as host

in dfe3f3d AHC started using full url rather than path for proxy host, but don't know why since issue link now broken. using full url causes urls like http://wgr_upd_en.livejournal.com/data/rss (which has proxy on other end) to fail with invalid version.

Author: jloomis

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

@@ -511,8 +511,6 @@ private static HttpRequest construct(AsyncHttpClientConfig config,
  HttpRequest nettyRequest;
  if (m.equals(HttpMethod.CONNECT)) {
  nettyRequest = new DefaultHttpRequest(HttpVersion.HTTP_1_0, m, AsyncHttpProviderUtils.getAuthority(uri));
- } else if (config.getProxyServer() != null || request.getProxyServer() != null) {
- nettyRequest = new DefaultHttpRequest(HttpVersion.HTTP_1_1, m, uri.toString());
  } else {
  StringBuilder path = new StringBuilder(uri.getRawPath());
  if (uri.getQuery() != null) {