Completely drop support for Tor 0.2.2.x
We should remove 0.2.2.x from the recommended version list.
We should stop accepting Tor 0.2.2.x nodes in the network: that release series is completely unsupported.
Finally dropping 0.2.2.x will let us start deprecating things that we'd like to throw away, like the renegotiation-based handshake.