reuse sessionId from ems #19
Description
DevNull uses eventId and sessionId from ems to recognize talks. The new api has an conferenceId and a sessionId. It looks like the conferenceId matches the eventId in ems. The sessionId kinda looks like an uuid but lacks the dash(-).
To make it easier to system that today integrates with ems it had been nice if the conferenceId and sessionId matches the ones used in ems. Also for new events they should follow the same pattern.