ACE-454 / ACE-455:

- upgraded to latest Felix UserAdmin bundles as first fix for ACE-454
  (the user admin store wasn't correctly read upon restart of the 
  bundle/server);
- UpdateUserAdminTask did not persist the version of its repository,
  causing it to always think it should upgrade the user admin config
  (2nd fix for ACE-454);
- simplified the interface of UserAdminConfigurator by removing the
  unnessary (and unused) methods;
- remove the 'serveruseradmin' bundle that always creates a static
  user in the UserAdmin, which is a potential security hole (ACE-455);
- fixed all unit tests that still relied on the existance of the 
  statically created user.



git-svn-id: https://svn.apache.org/repos/asf/ace/trunk@1569011 13f79535-47bb-0310-9956-ffa450edef68