Only collect puppetdb activemq metrics in 2015.y versions of PE
Only collect puppetdb activemq metrics in 2015.y versions of PE

Apparently the rest of the metrics had different names in 2015 so
they just result in a bunch of 'could not find mbean' errors.

npwalker/pe_metric_curl_cron_jobs,npwalker/pe_metric_curl_cron_jobs