add http2 health check parameters for ConfigureTransport

[duyanghao]

Currently, ConfigureTransport can't configure http2 health check parameters(i.e. http2.Transport.ReadIdleTimeout and http2.Transport.PingTimeout).
This PR add http2 health check transportOption for ConfigureTransport when configures a net/http HTTP/1 Transport to use HTTP/2.

Signed-off-by: duyanghao [email protected]

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[duyanghao]

@googlebot I signed it!

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[caesarxuchao]

This seems duplicate of #74.

[caesarxuchao]

(I don't mind abandoning #74 if you can get this one in :)

[duyanghao]

(I don't mind abandoning #74 if you can get this one in :)

I'd be delighted to do so as variadic function looks better.

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This PR (HEAD: a9d7b68) has been imported to Gerrit for code review.

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[duyanghao]

@bradfitz Please take a look at this PR.

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Message from Go Bot:

Patch Set 1:

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

Next steps:
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 or adds a tag like "wait-release", 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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