2016-05-31  initial release
2018-03-08  changed snmp scan function
2018-03-13  code cleanup
2018-03-15  more code cleanup
2020-06-08  changed snmp-scan function
2020-11-10  removed perfdata
            added wato option to configure 'ignore disks'. For example on the Smart-1 5150 (Array has 12 Disks,
            but only 6 Disks are in the default hardware
2021-04-29: rename from checkpoint_soft_raid in to checkpoint_raid
2021-08-10: rewritten for CMK 2.0