2.0.0: Adds '--ignore_unknown_on_critical_or_warning' cli option, breaks inventory

Breaking Changes:

• the word chassi has been renamed to chassis, also in the inventory file and output.
  This potentially breaks existing integrations which use the inventory model.

Features:

• adds new cli option --ignore_unknown_on_critical_or_warning to ignore all 'UNKNOWN' errors if 'WARNING' or 'CRITICAL' issues are present #174
• adds support for HPE Compute Scale-up Server 3200, HPE Superdome Flex and BullSequana SH120 #168

Bugfixes:

• fixes issue with 'UNKNOWN' status on storage check with powered off HPE systems without storage controllers #170
• fixes status_text for faulty dimms and memory summary #179