0 - allow event id to be specified optionally to override the environment

Specify something like this to override, if not defined, it will use the environment's event_id from the database. An info print says when it is configured from the database and a debug print says when it is overridden.

CHECK_DAEMON_CHECK_EVENT_ID=ff64c641-de1e-43ff-a693-e909b4694c96

This changes the behavior in that in either case, the event_id will be set on startup and it will not dynamically re-configure when the environment's event_id is updated. The daemon will need to be restarted to pick up a new event_id from the env vars or from the database environment.