title: Jenkins auto created user account, how to login/change password?
body: <p>I've setup Jenkins, and it's working well.  It uses the Perforce plugin as the SCM, and builds automatically upon a checkin.  My issue is that when a user makes a commit to the tree it auto creates a user account on the system, but no password is set, and the user cannot login.</p>
  
  <p>The system is secured on a intranet, and I have set Jenkins to use "Jenkins own user database" and "Logged in users can do anything".  Problem is I can't find any way for someone to log in once they have made a commit, there username is shown in the list of auto-created accounts, but no password is ever sent. Is there a default password, or a way to reset?</p>
  
  <p>The system is running on Ubuntu 12 with Tomcat7 serving the Jenkins front end.</p>