add configuration for http2_max_concurrent_streams

[stamm]

What this PR does / why we need it: add configuration for http2 max concurrent streams

[k8s-ci-robot]

Hi @stamm. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[aledbf]

/ok-to-test

[codecov-io]

Codecov Report

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@@            Coverage Diff            @@
##             master    #4730   +/-   ##
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  Coverage          ?   58.69%           
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  Files             ?       88           
  Lines             ?     6762           
  Branches          ?        0           
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  Hits              ?     3969           
  Misses            ?     2355           
  Partials          ?      438

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[aledbf]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf, stamm

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