add rc 200 and 0 to touchstone config for router-perf and modifying default number of clients

[qiliRedHat]

1. The current touchstone config router-perf is using is https://github.com/cloud-bulldozer/e2e-benchmarking/blob/master/utils/touchstone-configs/mb-touchstone.json, it gets latency_95pctl. While avg_latency is also important, to get a feeling of the overall latency. In the real test, avg_latency is smaller than latency_95pctl. For example:

11-28 15:16:35.289      "avg_latency": 20011,
11-28 15:16:35.289      "latency_95pctl": 52734,
11-28 15:16:35.289      "latency_99pctl": 59614,

2. Getting the number of response code is useful to evaluate if the test load is too big for a cluster, for example when the total connection number is bigger than the cluster's capacity, more '0' response code is seen. This is useful when testing with connection related features, like https://docs.google.com/spreadsheets/d/1AvpLioEZB-HigjaKMNRa_GYiffVBiyP8arqvlm0BAZg/edit#gid=313345561. I used to manually collect those data from output of the router-perf test.

This PR is to add a touchstone config file to generate results for the 200 and 0 rc codes.
I didn't include all kinds of rc code, because other rc codes are rarely seen, getting all of them can make the results sheet not easy to read.

[comet-perf-ci]

Can one of the admins verify this patch?

[qiliRedHat]

Test result in this result sheet https://docs.google.com/spreadsheets/d/118stkJ5uzEhYCo8k9F6J0CfkEmepoE1EvCzVxmlhuxM/edit#gid=831215729
@rsevilla87 Could you help to review this?

[rsevilla87]

Hey @qiliRedHat , rather than adding another config file, why don't you add the new comparisons to the original?

[qiliRedHat]

@rsevilla87 If adding to the origin don't impact others, I'm more than happy to do that.

[qiliRedHat]

• Added the new metrics to mb-touchstone.json directly
• Did the default client number change in router-perf: update default CLIENTS after maxconn changed from 20k to 50k in 4.12 #519 (comment)

@rsevilla87 PTAL again

[qiliRedHat]

@rsevilla87 Please help to review again.

[rsevilla87]

cc: @mohit-sheth @jtaleric @dry923, changing default number of clients, as per 4.12 maxconns has been upgraded from 20K to 50K. Some context -> #519 (comment)

[rsevilla87]

lgtm!

[jtaleric]

lgtm