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That makes sure we aren't still writing/reading after we relinquish control.

fixes #40

may be related to https://github.com/ipfs/go-ipfs/issues/6197?

We only need it for the handshake.

and regenerate the protobufs with gogo faster

Also, secio now checks the remote peer ID as early as possible in the handshake. This should allow us to abort misdials much earlier.

1. Respect context. Before, we didn't respect the context when writing/reading
the final nonce.
2. Don't make assumptions about connection buffering. Read/write handshake
messages in parallel.
3. Return messages from ReadMsg to the buffer pool.
4. Close the connection on timeout. We can't reuse it at this point as there may
be an outstanding writer/reader (and we don't allow parallel reads/writes).

Because paranoia.

License: MIT
Signed-off-by: Hector Sanjuan <code@hector.link>