x/http/net: enable SetFrameReuse in server and client connections

[YHM404]

SetReuseFrames has been shown to improve the performance of go-grpc, so I believe it can similarly enhance the performance of HTTP server/client.

For golang/go#68352

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Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Patch Set 1:

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Message from Damien Neil:

Patch Set 4:

(1 comment)

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