Help now looks like:

	$ ./dist/oc3
	Manage the opensvc collector infrastructure components.

	Usage:
	  oc3 [command]

	Subsystems:
	  apicollector serve the collector api
	  feeder       serve the data feed api to nodes
	  messenger    notify clients of data changes
	  runner       dispatch actions to nodes
	  scheduler    start running db maintenance tasks
	  worker       run queued jobs

	Additional Commands:
	  completion   Generate the autocompletion script for the specified shell
	  help         Help about any command
	  version      display the oc3 version

	Flags:
	      --debug   set log level to debug
	  -h, --help    help for oc3

	Use "oc3 [command] --help" for more information about a command.

Align config head sections names with subsystem names.
Adapt your config to follow this breaking change.