Remove list of users from the login screen of the GUI

In RHEL 6, when the server is up in run level 5, a list of users from /etc/passwd appears on the console. Building our first production boxes on RHEL 6, we were asked to remove this as the customer viewed it as a security issue for anyone with access to the VMWare console to be able to view all user accounts on the server. 
 

I don't think this feature is needed and provides more of a risk to security than any benefits. This can be edited by going to opening /etc/gconf/gconf.xml.defaults/%gconf-tree.xml and change the boolean for disable_user_list from false to true.  I'd like to see this removed in the RHEL 7.