xfstests: filter selinux output in _acl_ls etc

xfstests: filter selinux output in _acl_ls etc

When selinux is on, ls -l gives us a "." to indicate selinux
attrs, which breaks some tests:

 === Test minimal ACE ===
 Setup file
--rwxrw-r-- id1 id2 file1
+-rwxrw-r--. id1 id2 file1

so make an _ls_l helper to filter that out.

Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Reviewed-by: Christoph Hellwig <hch@lst.de>