Added code to enable WRR support in fio plugin Signed-off-by: ntsaravana <saravanan.ns@hcl.com> Change-Id: Ie82554538c720e0a956d38716293f45a0fdc709c Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/2759 Community-CI: Mellanox Build Bot Tested-by: SPDK CI Jenkins <sys_sgci@intel.com> Reviewed-by: Jim Harris <james.r.harris@intel.com> Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>