http_interop: Remove requirement for header values to be UTF-8 #1694

Job	Run time
Docs	40s
Lint	35s
cargo-deny (aarch64-apple-ios)	27s
cargo-deny (aarch64-linux-android)	26s
cargo-deny (i686-pc-windows-gnu)	28s
Test	1m 5s
cargo-deny (i686-pc-windows-msvc)	23s
Test (json)	1m 23s
cargo-deny (i686-unknown-linux-gnu)	28s
Test (charset)	1m 25s
cargo-deny (wasm32-unknown-unknown)	22s
Test (cookies)	1m 16s
cargo-deny (x86_64-apple-darwin)	24s
Test (socks-proxy)	1m 26s
cargo-deny (x86_64-apple-ios)	28s
Test (native-certs)	1m 7s
cargo-deny (x86_64-pc-windows-gnu)	26s
Test (gzip)	1m 15s
cargo-deny (x86_64-pc-windows-msvc)	27s
Test (brotli)	1m 7s
cargo-deny (x86_64-unknown-linux-gnu)	24s
cargo-deny (x86_64-unknown-redox)	26s
Test (http-interop)	1m 10s
Test (tls)	1m 28s
Test (tls, json)	1m 22s
Test (tls, charset)	1m 27s
Test (tls, cookies)	1m 48s
Test (tls, socks-proxy)	1m 17s
Test (tls, native-certs)	1m 44s
Test (tls, gzip)	1m 28s
Test (tls, brotli)	1m 19s
Test (tls, http-interop)	1m 24s
Test (native-tls)	1m 14s
Test (native-tls, json)	1m 27s
Test (native-tls, charset)	1m 33s
Test (native-tls, cookies)	1m 28s
Test (native-tls, socks-proxy)	1m 16s
Test (native-tls, native-certs)	1m 22s
Test (native-tls, gzip)	1m 17s
Test (native-tls, brotli)	1m 19s
Test (native-tls, http-interop)	1m 24s
	43m 15s

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