Remove shapeshifter from openvpn container

We'll run obfs4 bridge processes in a separate obfsvpn container which can be colocated with the openvpn gateway or hosted separately.

Additionally removes some out of date documentation.

conf/services.d/shapeshifter-dispatcher/finish

-#!/bin/sh
-
-echo "Exiting shapeshifter-dispatcher"
-s6-svscanctl -t /var/run/s6/services