LU-9314 osd: cleaup qsd once commit callbacks are done

LU-9314 osd: cleaup qsd once commit callbacks are done

otherwise osd_trans_commit_cb() calling qsd_op_end() may
find qsd structure released.

Change-Id: Ifd64b17d636f5e728ed6a4ad1a2d4d43998c90ec
Signed-off-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-on: https://review.whamcloud.com/26496
Tested-by: Jenkins
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Mike Pershin <mike.pershin@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>