fix(http2/client): avoid double-polling a Select future #1
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This reworks http2 client connection task in order to avoid storing a `Select` future. Under some scheduling cases the future was polled multiple times, resulting in runtime panics: ``` thread 'main' panicked at 'cannot poll Select twice', /index.crates.io/futures-util-0.3.28/src/future/select.rs:112:42 stack backtrace: [...] 5: <futures_util::future::select::Select<A,B> as core::future::future::Future>::poll 6: <hyper::proto::h2::client::H2ClientFuture<B,T> as core::future::future::Future>::poll [...] ``` Closes hyperium#3289
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This reworks http2 client connection task in order to avoid storing a
Selectfuture.Under some scheduling cases the future was polled multiple times, resulting in runtime panics:
Ref: hyperium#3290