Opt-in overhaul to how MSG_SERVICE_REQUEST is done

- New subclass(es) for opt-in use. Most below messages refer to them,
  not parent classes.
- In parent classes, make handler tables instance attributes for easier
  subclass twiddling.
- Refactor Transport-level session check
- Refactor Transport-level auth handler instantiation (but keep behavior
  the same, for now)
- Add service-request handler to Transport subclass, and remove from
  AuthHandler subclass
- Remove manual event injection from the handful of Transport auth
  methods which supported it. Suspect unused, don't need the extra
  complexity, and wasn't consistent anyways - can add back smarter later
  if anyone needs it.
- Not bothering with gssapi at all for now as I cannot easily test it
- Primarily tested against the new AuthStrategy architecture

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