Allow the report processor to run on PE

The PE puppetserver runs as `pe-puppet`, not `puppet`. 

The `$settings::user` variable resolves to the user that the Puppet Master node is configured to run as. This patch assumes that you are either enforcing as the agent on the Puppet Master node, or that if you're enforcing on a compile master that it will be the same as the Master of Masters.

Author: binford2k

manifests/init.pp

@@ -24,6 +24,7 @@
 #       Will send results from your puppet agent runs back to the datadog service.
 #   $puppetmaster_user
 #       Will chown the api key used by the report processor to this user.
+#       Defaults to the user the puppetmaster is configured to run as.
 #   $non_local_traffic
 #       Enable you to use the agent as a proxy. Defaults to false.
 #       See https://github.com/DataDog/dd-agent/wiki/Proxy-Configuration
@@ -185,7 +186,7 @@
   $facts_to_tags = [],
   $puppet_run_reports = false,
   $puppet_gem_provider = 'puppetserver_gem',
-  $puppetmaster_user = 'puppet',
+  $puppetmaster_user = $settings::user,
   $non_local_traffic = false,
   $dogstreams = [],
   $log_level = 'info',