add trace point for latency breakdown

Signed-off-by: xinxinshu <xinxin.shu@intel.com>
rm subop trace

Signed-off-by: xinxinshu <xinxin.shu@intel.com>
add sample interval

Signed-off-by: xinxinshu <xinxin.shu@intel.com>
don't dump message when read/write trace vector is empty

Signed-off-by: xinxinshu <xinxin.shu@intel.com>
add ops_zero_count config option

Signed-off-by: xinxinshu <xinxin.shu@intel.com>