Description of problem:
  Cannot remove project members via the 'X' icon

Version-Release number of selected component (if applicable):
openshift v3.7.0-0.184.0
kubernetes v1.7.6+a08f5eeb62
  
-bash-4.2# oc rsh -n default registry-console-1-pzrh9 rpm -qa | grep cockpit
cockpit-ws-151-1.el7.x86_64
cockpit-dashboard-151-1.el7.x86_64
cockpit-system-151-1.el7.noarch
cockpit-bridge-151-1.el7.x86_64
cockpit-kubernetes-151-1.el7.x86_64


How reproducible:
Always

Steps to Reproduce:
1. Login the registry console and create project pro1 with use1
2. Go to projects tab, expand the project pro1 and try to delete the roles by the 'X' icon.
3. Click Delete in the opened the panel

Actual results:
3. The delete operation doesn't work, the role still exists.

Expected results:
3. Should delete the role successfully

Additional info: