[PR PATCH] [Closed]: idmap_rid: default group always set to "Domain Users"

[github at samba.org]

There's a closed pull request on the Samba Samba Github repository

idmap_rid: default group always set to "Domain Users"
https://github.com/samba-team/samba/pull/159
Description: https://bugzilla.samba.org/show_bug.cgi?id=13371

I don't know whether I've taken the right approach to fixing this, but essentially this forward ports some of the code removed in [this commit](https://github.com/samba-team/samba/commit/241c81b2763392439043261cf179cd2c8793faed) which broke primary groups for the rid backend (gecos was broken also).