Body::discard() to discard and re-pool connection #2616

Job	Run time
build_versions (stable)	9s
build_versions (beta)	16s
Docs	1m 26s
build_versions (1.71.1)	17s
cargo-deny (aarch64-apple-ios)	18s
Test	41s
cargo-deny (aarch64-linux-android)	17s
Test (charset)	44s
Lint	18s
cargo-deny (i686-pc-windows-gnu)	22s
Test (cookies)	1m 1s
cargo-deny (i686-pc-windows-msvc)	22s
Test (socks-proxy)	45s
cargo-deny (i686-unknown-linux-gnu)	19s
Test (gzip)	54s
Test	35s
Test (charset)	30s
cargo-deny (wasm32-unknown-unknown)	20s
cargo-deny (x86_64-apple-darwin)	21s
Test (cookies)	37s
Test (socks-proxy)	32s
Test (brotli)	47s
cargo-deny (x86_64-apple-ios)	21s
Test (gzip)	32s
Test (json)	57s
cargo-deny (x86_64-pc-windows-gnu)	22s
Test (brotli)	29s
Test (native-tls)	49s
cargo-deny (x86_64-pc-windows-msvc)	27s
Test (json)	30s
cargo-deny (x86_64-unknown-linux-gnu)	22s
Test (native-tls)	40s
cargo-deny (x86_64-unknown-redox)	20s
	17m 40s

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