LU-6210 utils: Use consistent naming for option strings

LU-6210 utils: Use consistent naming for option strings

This patch makes no functional changes.  The option strings in
jt_lfsck_start() and jt_lfsck_stop() are renamed to short_opts
for consistency.

Test-Parameters: trivial
Signed-off-by: Steve Guminski <stephenx.guminski@intel.com>
Change-Id: Id29ef63aa2ef62223d72f31374eb0a93badc280e
Reviewed-on: https://review.whamcloud.com/27792
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Tested-by: Jenkins
Reviewed-by: Fan Yong <fan.yong@intel.com>