Han-Wen Nienhuys 77014cf7f9 ssh: prevent double kex at connection start, 2nd try
The previous attempt would fail in the following scenario:

* select picks "first" kex from requestKex

* read loop receives a remote kex, posts on requestKex (which is now
  empty) [*] for sending out a response, and sends pendingKex on startKex.

* select picks pendingKex from startKex, and proceeds to run the key
  exchange.

* the posting on requestKex in [*] now triggers a second key exchange.

Fixes #18861. 

Change-Id: I443e82f1d04c7f17d1485fdb87072b9feec26aa8
Reviewed-on: https://go-review.googlesource.com/36055
Run-TryBot: Han-Wen Nienhuys <hanwen@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Han-Wen Nienhuys <hanwen@google.com>
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This repository holds supplementary Go cryptography libraries.

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https://golang.org/x/crypto
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