LU-4587 utils: remove llapi_ping_target()

LU-4587 utils: remove llapi_ping_target()

Remove llapi_ping_target(). This ioctl() based function was prototyped
in lustreapi.h but not provided by lustreapi. Replace its only use (in
lfs) with the equivalent /proc based function llapi_target_check(),
which is provided by lustreapi. Remove the now unnecessary calls to
ptl_initialize(), obd_initialize() and obd_finalize() in lfs main().

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: I02d7ea706f02827bbd4bd1b9bf0d216b0e2c131b
Reviewed-on: http://review.whamcloud.com/10566
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Emoly Liu <emoly.liu@intel.com>
Reviewed-by: Yang Sheng <yang.sheng@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: James Simmons <uja.ornl@gmail.com>