pom: update to nfs4j-0.8.2

Changelog for nfs4j-0.8.1..nfs4j-0.8.2
    * [aac3b33] calculate index in the FsExport constructor

Target: 2.9
Require-book: no
Require-notes: no
Merge pull request #969 from kofemann/update-nfs-2.9

pom: update to nfs4j-0.8.2