"Live" debug options

[diafour]

Debug endpoint introduced by #8 can be used to set debug options in runtime:

• endpoints:
  • /debug/settings[.json|.yaml] — list settings (DebugKeepTmpFiles, LogLevel, etc.)
  • /debug/settings/ GET | PUT (set value) | DELETE(reset to default)
• add cli command debug to addon-operator:
  • shell-operator debug settings list [-o yaml|json]
  • shell-operator debug settings get <name>|<group>
  • shell-operator debug settings set <name> <value>
  • shell-operator debug settings reset <name>
• possible options:
  • debug.keepTmpFiles
  • log.level
  • debug.log.helmOutput — log output from helm commands
  • debug.log.kubernetesEvents — log information about incoming kubernetes events
  • debug.log.kubernetesEvents.dumpObjects — also dump incoming objects
  • ...

[diafour]

More debugging tools:

• Debug log buffer. A user can get debug log even if the log level is not a debug.
• Get 'live' log focused on module/hook/binding.
• Change log level for module/hook/binding.
• ~Get snapshots from Monitor for hook or binding.~ (#345)
• Toggle logging of Kubernetes events and incoming objects for hook or binding.
• Show history of hook executions for the module.
• Task execution history in queue listing. Show N finished tasks for shell-operator debug queue.
• ~Show queues for the module. Main queue + all queues in module hooks.~ (#105, #345)