Merge PR #22479 into master

Merge PR #22479 into master

* refs/pull/22479/head:
	mgr/devicehealth: add self-test
	mgr/devicehealth: make config options instance attributes
	mgr/devicehealth: active -> enable_monitoring
	mgr/mgr_module: update docstring for get()
	mgr/devicehealth: fix 'device get-health-metrics' when no metrics are stored
	mgr/devicehealth: add some scraping infrastructure
	osd: optionally query smart for a single devid
	mgr/ActivePyModules: add get for 'device <devid>'
	osd: key smart results by unique device id
	mgr: enable devicehealth by default
	mgr/devicehealth: rename old smart module to devicehealth