Logging to the rsyslog under the facility local0.

- General logging with the priority info with tag HEALTH.
- Exceeding warning temp logged with the priority warning
  with the tag WARNING.
- Exceeding maximal temp logged with the priority emerg
  with the tag FATAL.
- Reaching exactly the maximal temp logged with the priority
  warning with the tag ERROR.
- There is recommended to configue those rsyslog log files:
  temperaturechech.log   - all messages
  temperaturechech.warn  - warning and shutdown messages
  temperaturechech.emerg - shutdown messages