vfs_nfs4acl_xattr: modernize ACL inheritance

vfs_nfs4acl_xattr: modernize ACL inheritance

This changes the way ACL inheritance is achieved in this
module.

Previously the module recursed to the next parent directory until the
share root was reached or a directory with an ACL xattr. If the share
root didn't contain an ACL xattr either a default ACL would be used.

This commit removed this recursive scanning and replaces it with the
same mechanism used by vfs_acl_xattr: by setting "inherit acls = yes"
just let smbd do the heavy lefting and inheritance.

For any file without ACL xattr we still synthesize a default ACL,
leveraging the existing default ACL function used by vfs_acl_xattr.

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>