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When adding additional integration tests around dialing over TLS I
learned that the original implementation just simply never ever worked.
The NBD server state machine still expects to begin option negotiation
outside of TLS, one of which must be OPT_STARTTLS in order to upgrade
the existing connection to a secure one, rather than expecting a TLS
handshake and then engaging in option negotation.
I've added support for NBD_OPT_STARTTLS along with a corresponding
integration test.