bug 1255608 - Add Groups to user filter
bug 1255608 - Add Groups to user filter

Adds groups to the Django admin list view for users, to allow admins to
easily see user accounts assigned to a group.

ollie314/kuma,Elchi3/kuma,SphinxKnight/kuma,yfdyh000/kuma,jwhitlock/kuma,jgmize/kuma,SphinxKnight/kuma,jgmize/kuma,escattone/kuma,yfdyh000/kuma,escattone/kuma,jwhitlock/kuma,ollie314/kuma,yfdyh000/kuma,SphinxKnight/kuma,a2sheppy/kuma,mozilla/kuma,yfdyh000/kuma,Elchi3/kuma,Elchi3/kuma,Elchi3/kuma,jwhitlock/kuma,a2sheppy/kuma,escattone/kuma,safwanrahman/kuma,mozilla/kuma,ollie314/kuma,mozilla/kuma,mozilla/kuma,safwanrahman/kuma,jgmize/kuma,SphinxKnight/kuma,jgmize/kuma,safwanrahman/kuma,yfdyh000/kuma,safwanrahman/kuma,Elchi3/kuma,safwanrahman/kuma,jwhitlock/kuma,jwhitlock/kuma,jgmize/kuma,a2sheppy/kuma,jgmize/kuma,ollie314/kuma,ollie314/kuma,a2sheppy/kuma,mozilla/kuma,SphinxKnight/kuma,a2sheppy/kuma,SphinxKnight/kuma,yfdyh000/kuma,ollie314/kuma,safwanrahman/kuma