small performance improvement in nfs3.readdir*() - reuse inode stat for verifier generation saving a repeated call to fs.getAttr (and a repeated access check as a result). also switch from using mtime to generation #
Merge pull request #10 from radai-rosenblatt/readdir-perf

small performance improvement in nfs3.readdir*() - reuse inode stat for ...
fix issue with Stat.toString() when size=0 (log returns -inf)