Change to HttpClient return type based on new API

Changed the return type to HttpClient based on changes to internal API. This might be a compatibility issue.

driver/src/com/sun/faban/driver/transport/sunhttp/URLStreamHandlerFactory.java

@@ -69,7 +69,7 @@ protected Map<KeepAliveKey, List<HttpClient>> initialValue() {
      * @return An object in the cache, or null if there is none.
      */
     @Override
-	public Object get(URL url, Object obj) {
+	public HttpClient get(URL url, Object obj) {
         Map<KeepAliveKey, List<HttpClient>> map = localHash.get();
         KeepAliveKey dkak = new KeepAliveKey(url);
         List<HttpClient> clientVector = map.get(dkak);