perf/benchmark: update plaintext postrun script (#1354)
perf/benchmark: update plaintext postrun script (#1354)

Signed-off-by: Xiang Dai <c54c64cf7043291b886753756d851be401eacd91@foxmail.com>
istio/tools,istio/tools,istio/tools,istio/tools,istio/tools,istio/tools