LU-6210 utils: Use C99 initializer in jt_obd_md_common()

LU-6210 utils: Use C99 initializer in jt_obd_md_common()

This patch makes no functional changes.  The long_opts struct
initializer in jt_obd_md_common() is updated to C99 syntax.

C89 positional initializers require values to be placed in the
correct order. This will cause errors if the fields of the struct
definition are reordered or fields are added or removed. C99 named
initializers avoid this problem, and also automatically clear any
values that are not explicitly set.

Test-Parameters: trivial
Signed-off-by: Steve Guminski <stephenx.guminski@intel.com>
Change-Id: Ifa7140e9980570940f8dfd1200307d02242a8c45
Reviewed-on: https://review.whamcloud.com/27879
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>