userportal : User has insufficient permissions on url /domain/domain_id/user

From user portal we should not be able to see all domain users.
Those users who have manipulate_permissions should be able
to see all user who have been added to the system.

Change-Id: I2ff611309ec35c4bcca5fcea6457af139c86e8f4
Bug-Url: https://bugzilla.redhat.com/923197
Signed-off-by: Ravi Nori <rnori@redhat.com>