2018-05-02: fixed: monthly_quota_on_cloud_used = ''
2018-05-30: removed 'unknown' OIDs
            removed counters for last day, last week, last month
            code cleanup
2020-06-08: changed snmp-scan function
2022-09-08: fixed missing check_default_parameters
            fixed levels for remaining quota in cloud, use lower instead of upper
2022-11-30: WATO: fixed CheckParameterRulespecWithoutItem (from CheckParameterRulespecWithItem)