Generic check for printers supporting SNMP Printer MIB
This Nagios plugin queries prtAlertTable from the Printer MIB.
It honors only prtAlertTrainingLevel = trained(4) or fieldService(5),prtAlertTrainingLevel = other(1),unknown(2),untrained(3) and management(6) are ignored.
For prtAlertSeverityLevel = warning(4) the plugin result is "WARNING",
for critical(3) the plugin result is "CRITICAL", obviously,
for warningBinaryChangeEvent(5) (new in RFC3805) the state is by default
"WARNING", but there is a hardcoded table of change events, which result in