noc/noc#1515 Add Sensor ETL model.
See merge request !5371 (merged)
(cherry picked from commit 1ae1b6cb)
ee285b76 Add Sensor ETL model. 60b69dc3 Set workflow_event_model to Sensor. 03da772c Add remote_system, remote_id to Sensor. 5ccb67be Fix typo. 21029c9b Cleanup MeasurementUnits on sensor loader.