libs: update to nfs4j-0.8.1

Changelog for nfs4j-0.8.0..nfs4j-0.8.1
    * [a041674] nfsv41: client: do not send getattr to DS
    * [2b6703e] test: suppress deprecation warning
    * [3a33b4c] acl: fix permission check on listdirectory
    * [e6f0783] mount: add support for symlinks

Ticket: #8410
Acked-by: Paul Millar
Target: master, 2.10, 2.9, 2.8, 2.7, 2.6
Require-book: no
Require-notes: yes