BugLink: http://bugs.launchpad.net/bugs/1531539

Exposes the NGUID, EUI-64, and NSID to sysfs entries under the disk's
kobject.
Signed-off-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
(cherry picked from commit 2b9b6e86)
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>