s3: smbd: posix_acls: Fix check for setting u:g:o entry on a filesystem with no ACL...

s3: smbd: posix_acls: Fix check for setting u:g:o entry on a filesystem with no ACL support.

Since 4.0.x we add 2 additional ACE entries, one SMB_ACL_USER
and SMB_ACL_GROUP to match the existing SMB_ACL_USER_OBJ and
SMB_ACL_GROUP_OBJ entries. The two additional entries break
the simple "must have 3 entries" check done inside convert_canon_ace_to_posix_perms().
Replace this with a more complete test.

Problem and initial fix provided by <tcleamy@ucdavis.edu>

BUG: https://bugzilla.samba.org/show_bug.cgi?id=10489

Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Uri Simchoni <uri@samba.org>
Autobuild-User(master): Uri Simchoni <uri@samba.org>
Autobuild-Date(master): Thu Feb 11 11:14:53 CET 2016 on sn-devel-144

(cherry picked from commit 5172bf0c5b0672c1479c2ad776460956aa469bca)