[oozie] Use new metric collection system

if we do this, then the /admin/instrumentation endpoint will give a 503 error and the /admin/metrics endpoint should be used instead, which has a similar, but slightly different format with more stats that Hue would need to be updated for.

You can either check for that or look at the /admin/configuration endpoint and check if the "oozie.services.ext" property includes "org.apache.oozie.service.MetricsInstrumentationService" or not.