mtree acl [patch]

[Andrew Pantyukhin]

I was surprised to learn that ACL support in our mtree is limited
to a shy mention here:
http://www.freebsd.org/news/status/report-dec-2001-jan-2002.html#TrustedBSD-ACLs

Would something like the patch attached be feasible? I can add
support for default lists, maybe restoring, etc., if the overall
idea does not seem wrong.

Also here: http://heka.cenkes.org/sat/diffs/mtree_acl.diff

Thanks for your time!
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