Commits on Feb 15, 2022

1. pd: use tokio_util::sync::PollSender in consensus svc …

   In v0.7 of `tokio-util`, the `PollSender` API was changed to have the
   semantics that most users expect (see tokio-rs/tokio#4214). The
   `poll_send_done` method was replaced with a `poll_reserve` method, and
   the implementation rewritten to drive a `Sender::reserve_owned` future
   that's consumed in `send_item`. Now, `PollSender` essentially implements
   exactly the same code that was written by hand in the consensus service.
   We can simplify the consensus service significantly by upgrading the
   `tokio-util` dependency to 0.7 and replacing the hand-written version
   with `PollSender`.
   
   There should be no functional change as a result of this refactor.

   

   hawkw committed Feb 15, 2022
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