s3-nfs4acls: Remove lookup_sid and sidmap from NFSv4 ACL mapping and check gid first

s3-nfs4acls: Remove lookup_sid and sidmap from NFSv4 ACL mapping and check gid first

By checking just the IDMAP, and by removing the sidmap and lookup_sid calls, we support
IDMAP_BOTH.  This is because by checking for a mapping to a GID first, we can rely on
the fact that IDMAP_BOTH will resolve to a GID.

If the sidmap idea is valued - it allows multiple SIDs to map to a single unix ID, this should
be done in the IDMAP layer.

Andrew Bartlett

Signed-off-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Sat Aug 11 01:17:36 CEST 2012 on sn-devel-104