Updated members dropdowns
## What does this MR do?
EE has different dropdowns to allow for group LDAP members to be overridden, this ports the dropdown changes over to reduce conflicts.
## Screenshots (if relevant)
![Screen_Shot_2016-12-07_at_15.28.20](/uploads/6cb6def34015b024dc878aa3b99be4a0/Screen_Shot_2016-12-07_at_15.28.20.png)
See merge request !7974