NFS: fix open_owner_id_maxsz and related fields.

NFS: fix open_owner_id_maxsz and related fields.

A recent change increased the size of an NFSv4 open owner, but didn't
increase the corresponding max_sz defines.  This is not know to have
caused failure, but should be fixed.

This patch also fixes some relates _maxsz fields that are wrong.

Note that the XXX_owner_id_maxsz values now are only the size of the id
and do NOT include the len field that will always preceed the id in xdr
encoding.  I think this is clearer.

Reported-by: David Disseldorp <ddiss@suse.com>
Fixes: d98f72272500 ("nfs: simplify and guarantee owner uniqueness.")
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>