http2: do not retry dial if request context canceled

[Taction]

When request context is canceled or expired, do not retry on dialing to the server.

Fixes golang/go#67665

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Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Patch Set 1:

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This PR (HEAD: f520097) has been imported to Gerrit for code review.

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Message from Damien Neil:

Patch Set 3:

(1 comment)

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Message from chao zhang:

Patch Set 3:

(1 comment)

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