LU-2550 osc: set resend count properly

LU-2550 osc: set resend count properly

The resend count of new io request should be set properly
in osc_brw_redo_request().

Signed-off-by: Niu Yawei <yawei.niu@intel.com>
Change-Id: If02f0f9abeb316f0718d34d0d1858985209acbb0
Reviewed-on: http://review.whamcloud.com/5184
Tested-by: Hudson
Reviewed-by: Johann Lombardi <johann.lombardi@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Bobi Jam <bobijam@gmail.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>