LU-5814 lov: flatten struct lov_stripe_md

LU-5814 lov: flatten struct lov_stripe_md

Flatten out the lsm_wire struct from the middle of struct
lov_stripe_md and remove the member name macros.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: I53455d4f42860d4c7e5541f1f18b0c451a022c28
Reviewed-on: http://review.whamcloud.com/12581
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Bobi Jam <bobijam@gmail.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>