Check_MK Werk 4548: Added new checks for liebert devices

ID: 4548 Title: Added new checks for liebert devices Component: Checks & agents Level: 1 Class: New feature Version: 1.5.0i1 Including Checks for temperatures, fans, humidity, system events, pressure, fluids, etc. Please the manpage of the checkplugins for details. Checkplugins added in this werk: liebert_chilled_water liebert_cooling_position liebert_fans_condenser liebert_maintenance liebert_system liebert_temp_fluid liebert_compressor liebert_cooling_status liebert_humidity_air liebert_pump liebert_system_events liebert_temp_general liebert_cooling liebert_fans liebert.include liebert_reheating liebert_temp_air