Enhancements to wtmp beacon
Enhancements to wtmp beacon

This adds the following functionality:

- `action` key added to the event data (either "login" or "logout")
- Configurable ut_type to distinguish login and logout events (because
  hey, why the hell not)
- Use of `__context__` to store user attached to a given tty so that we
  can report the user that logged out.

saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt