Replaced localhost with 127.0.0.1 in PluginManagerTests

Author: javanna

src/test/java/org/elasticsearch/test/integration/plugin/PluginManagerTests.java

@@ -124,7 +124,7 @@ private void assertPluginLoaded(String pluginName) {
  }
 
  private void assertPluginAvailable(String pluginName) {
- HttpClient httpClient = new HttpClient("http://localhost:9200/");
+ HttpClient httpClient = new HttpClient("http://127.0.0.1:9200/");
  HttpClientResponse response = httpClient.request("_plugin/" + pluginName + "/");
  assertThat(response.errorCode(), Matchers.equalTo(RestStatus.OK.getStatus()));
  }