[maven-release-plugin] prepare release jpnfs-0.5.4
[maven-release-plugin] prepare for next development iteration
nfsv41: fix open stateid leak

OPEN/CLOSE operations should match stateid life cycle

Observed on desy CMS system

Acked-by: Karsten Schwank
Target: master, 0.5
Require-book: no
Require-notes: no
[maven-release-plugin] prepare release jpnfs-0.5.5
[maven-release-plugin] prepare for next development iteration