First in a series of patches to change how batching is implemented. Signed-off-by: paul luse <paul.e.luse@intel.com> Change-Id: Iaee780cd948beee66a37528fdad6fc6841ea642b Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/5486 Tested-by: SPDK CI Jenkins <sys_sgci@intel.com> Community-CI: Mellanox Build Bot Reviewed-by: Jim Harris <james.r.harris@intel.com> Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>