Add socket2 feature "all"

[jayvdb]

Without this, I see

error[E0599]: no method named `bind_device` found for struct `Socket` in the current scope
   --> /home/jayvdb/.cargo/registry/src/index.crates.io-6f17d22bba15001f/hyper-util-0.1.1/src/client/legacy/connect/http.rs:704:14
    |
703 | /         socket
704 | |             .bind_device(Some(interface.as_bytes()))
    | |             -^^^^^^^^^^^ method not found in `Socket`
    | |_____________|
    | 

error[E0599]: no method named `with_retries` found for struct `TcpKeepalive` in the current scope
   --> /home/jayvdb/.cargo/registry/src/index.crates.io-6f17d22bba15001f/hyper-util-0.1.1/src/client/legacy/connect/http.rs:130:12
    |
130 |         ka.with_retries(retries)
    |            ^^^^^^^^^^^^ help: there is a method with a similar name: `with_time`

For more information about this error, try `rustc --explain E0599`.
error: could not compile `hyper-util` (lib) due to 2 previous errors

[MeerKatDev]

v0.1.1 has this issue