title: Http connection unauthorized in gerrit trigger
body: <p>I am trying to setup Rest API for gerrit trigger jenkins plugin.
  I have created a service user in git.</p>
  
  <p>But now when i am entering the http username/password for service user and pressing test connection . I am getting Http connection unauthorized connection.</p>
  
  <p>HTTP password is nothing but the SSH public key added in the gerrit config UI.</p>
  
  <p>Best Regards,
  Saurav</p>