hide internal samba groups in combobox (WIP)
Merge branch 'master' into jacalvo/hide-internal-groups-combobox
hide by sid and by showAdvancedViewOnly in comboboxes
kerberos principal users are also hidden

and delete wrong duplicated hiddenSid
Merge pull request #548 from Zentyal/jacalvo/hide-internal-groups-combobox

Jacalvo/hide internal groups combobox