Rolebindings are not cleaned up after project is deleted.

Issue

• When a binding crosses namespaces is created, the deletion of the project will not remove its binding with other project.
  For ex: Create 2 projects : "A" and "B". Then give the project "B" the system:image-puller role on the project "A". Then delete the project "B". Then inspect rolebindings of project "A", notice that it still has the rolebinding for project A even though it doesn't exist.

# oc policy add-role-to-group system:image-puller system:serviceaccounts:ProjectB -n ProjectA
# oc delete project ProjectB
# oc get rolebinding -n ProjectA