`rustls::ConnectionCommon::complete_io` could fall into an infinite loop based on network input

If a closenotify alert is received during a handshake, completeio does not terminate. Callers which do not call completeio are not affected. rustls-tokio and rustls-ffi do not call completeio and are not affected. rustls::Stream and rustls::StreamOwned types use completeio and are affected...