http2: Fix SETTINGS_HEADER_TABLE_SIZE handling in client

[pacevedom]

According to RFC 7540 Section 6.5.2 the SETTINGS frame with parameter SETTINGS_HEADER_TABLE_SIZE allows the sender to inform the remote endpoint the maximum size of the dynamic table for HPACK. The encoder can use any size equal or less than this value.

This is not handled properly in Go HTTP2 client when a server sends this SETTINGS frame, causing header compression failures on subsequent requests that lead to protocol errors, GOAWAY and RST_STREAM failures. This PR fixes this behavior by addressing the handling of this parameter.

[gopherbot]

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[gopherbot]

Message from Go Bot:

Patch Set 1:

Congratulations on opening your first change. Thank you for your contribution!

Next steps:
Within the next week or so, a maintainer will review your change and provide
feedback. See https://golang.org/doc/contribute.html#review for more info and
tips to get your patch through code review.

Most changes in the Go project go through a few rounds of revision. This can be
surprising to people new to the project. The careful, iterative review process
is our way of helping mentor contributors and ensuring that their contributions
have a lasting impact.

During May-July and Nov-Jan the Go project is in a code freeze, during which
little code gets reviewed or merged. If a reviewer responds with a comment like
R=go1.11, it means that this CL will be reviewed as part of the next development
cycle. See https://golang.org/s/release for more details.

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Please don’t reply on this GitHub thread. Visit golang.org/cl/227237.
After addressing review feedback, remember to publish your drafts!