Nick Sellen authored Aug 23, 2017 and Matthias Larisch committed Aug 28, 2017

Connects to redis to find the session ids for a given user based
on looking for the following sets::

  php:user:<userid>:sessions
  api:user:<userid>:sessions

... also checks if those sessions are valid, by looking in:

  PHPREDIS_SESSION:<sessionid>
  :1:django.contrib.sessions.cache<sessionid>

and cleans up the sets if the sessions are not still there