net/http: clear reference to the request context after transport getConn

[AlexanderYastrebov]

Clears wannConn ctx and prevents pending dialConnFor after connection delivered or canceled.

Updates #50798

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Message from Alexander Yastrebov:

Patch Set 1:

(1 comment)

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Message from Alexander Yastrebov:

Patch Set 1:

(1 comment)

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Message from Damien Neil:

Patch Set 1: Run-TryBot+1

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Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Patch Set 1: TryBot-Result+1

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This PR (HEAD: fd6c83a) has been imported to Gerrit for code review.

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Message from Alexander Yastrebov:

Patch Set 2:

(1 comment)

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Message from Damien Neil:

Patch Set 2: Code-Review+2

(2 comments)

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Message from Alexander Yastrebov:

Patch Set 2:

(3 comments)

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Message from Ian Lance Taylor:

Patch Set 2: Run-TryBot+1

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Patch Set 2:

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Patch Set 2: TryBot-Result+1

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This PR is being closed because golang.org/cl/512196 has been merged.