Fix h2 request_summary

[Congyuwang]

Currently, HTTP/2 request_summary use HOST header for printing host, which is empty. While the path is also different from HTTP/1.x.

Before:

HTTP/1.x:

GET /, Host: example.com:8080

HTTP/2:

GET https://example.com:8080/, Host:

After this change: HTTP/2:

GET /, Host: example.com:8080

[Congyuwang]

The CI error is interesting, maybe unrelated to this PR but I encountered it also in my own work:

[2024-08-07T07:43:35Z WARN  pingora_core::protocols::http::v1::server] Respond header is already sent, cannot send again

This warning seems likely to be followed with Upstream broken pipe. I don't know if this is as expected, or likely a bug. If needed, I can file an issue about this.

[andrewhavck]

CI error looks like a flaky test. That warning is expected, it means an error occurred and since we already wrote response headers we cannot send them again with the error status.

[Congyuwang]

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