Update for latest MQ and mq-golang levels. New metric support.

• Update to use v5.2.2 of the mq-golang repository
• Update to use MQ 9.2.3
• Allow prometheus collector to continue running even when qmgr down (#67)
  • Report qmgr_status metric in such a situation
  • Updated "QMgr Status" sample dashboard to report both that metric and the new cluster status metric
• Update influxdb collector to use V2 APIs (#76)
  • Note changes to configuration attributes - in particular support for an APIToken
  • New sample dashboard using some very basic Flux queries