Fix tidy for system metrics

Prior to this commit, the system metrics tidy was not functional. It
would error out do to restrictions in the `metrics_tidy` script. This
commit adds the system directories to the tidy script.

Author: Jarret Lavallee

files/metrics_tidy

@@ -32,7 +32,7 @@ done
 
 
 # Guard against deleting or archiving files outside of a Puppet service metrics directory.
-valid_paths=(puppetserver puppetdb orchestrator ace bolt activemq)
+valid_paths=(puppetserver puppetdb orchestrator ace bolt activemq system_processes system_memory system_cpu)
 
 # Arguments and defaults.
 metrics_directory="${metrics_directory:-/opt/puppetlabs/puppet-metrics-collector/puppetserver}"