Description of problem:
can't remove user

Version-Release number of selected component (if applicable):
ovirt 0.93

How reproducible:
always

Steps to Reproduce:
1. Open the oVirt Administration User Interface
2. Select the appropriate Hardware or Virtual Resource pool
3. From the menu, select User Access
4. Select the check box of one user
5. Click Remove on the toolbar
  
Actual results:
the user name still appears in the list of existing users though the tooltip shows that "user roles were successfully deleted". 

Expected results:
the user name no longer appears in the list of existing users

Additional info: