[Samba] idmap backend ad well-known-sids 512 & 513

[L.P.H. van Belle]

In addition to Rowland's. 

And be aware that there is a bug in 

unix_primary_group = 
You only see 10000 or Domain Users. 
If you change the primary groep to something else, it stays 10000/Domain users. 

See: 
default group always set to "Domain Users" not evaluating PrimaryGroupID ldap attribute
https://bugzilla.samba.org/show_bug.cgi?id=13371 


And 
You know that you have to set the UID/GID's yourself? 
https://wiki.samba.org/index.php/User_and_group_management

https://wiki.samba.org/index.php/Maintaining_Unix_Attributes_in_AD_using_ADUC 


Greetz, 

Louis