TiDB not use the new RC interface OnResponseWait

[nolouch]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

run big queries with high concurency will exceed the RU Limit a lot

2. What did you expect to see? (Required)

under the limit or exceed a little

3. What did you see instead (Required)

exceed a log

4. What is your TiDB version? (Required)

master