Make socket address obvious

We don't need a valid http host for the nginx api when we use a socket.
The host is ignored. This change makes it more obvious that the host is
unnecessary.

nginx-controller/main.go

@@ -220,8 +220,7 @@ func main() {
  if *nginxPlus {
  time.Sleep(500 * time.Millisecond)
  httpClient := getSocketClient()
- apiURL := fmt.Sprintf("http:https://127.0.0.1:%v/api", *nginxStatusPort)
- nginxAPI, err = plus.NewNginxAPIController(&httpClient, apiURL, local)
+ nginxAPI, err = plus.NewNginxAPIController(&httpClient, "http:https://nginx-plus-api/api", local)
  if err != nil {
  glog.Fatalf("Failed to create NginxAPIController: %v", err)
  }