LU-2234 man: Add zfs options to mkfs.lustre man page

Document zfs options in mkfs.lustre(8).  Also update index and fsname
options to match current requirements.

Signed-off-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Change-Id: I06e018c41b29d8f9ca8d1f2ef595140bed16096e
Reviewed-on: http://review.whamcloud.com/10629
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Cliff White <cliff.white@intel.com>