FSAL_ZFS: fix a leak in tank_readdir where dirents is never freed
FSAL_ZFS: Remove unusued struct member current_offset in zfs_fsal_obj_handle
FSAL_ZFS: check return value of write in tank_write
FSAL_HPSS: Complete rework for new FSAL API
FSAL_HPSS: add support for ATTR_[AM]TIME_SERVER
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FSAL_HPSS: fsal openflags are different from posix ones. HPSS's are the same as posix's, so use fsal2posix for now.