Introduce report result purging timer

The resources required for report result purging has been reduced,
so make sure this is scheduled.

https://bugzilla.redhat.com/show_bug.cgi?id=1348625

app/models/miq_schedule_worker/jobs.rb

@@ -117,6 +117,10 @@ def policy_event_purge_timer
     queue_work(:class_name => "PolicyEvent", :method_name => "purge_timer", :zone => nil)
   end
 
+  def miq_report_result_purge_timer
+    queue_work(:class_name => "MiqReportResult", :method_name => "purge_timer", :zone => nil)
+  end
+
   def storage_refresh_metrics
     queue_work(
       :class_name  => "StorageManager",

app/models/miq_schedule_worker/runner.rb

@@ -215,6 +215,12 @@ def schedules_for_scheduler_role
       enqueue :miq_alert_evaluate_hourly_timer
     end
 
+    # Schedule - Prune old reports Timer
+    every = worker_settings[:report_result_purge_interval]
+    scheduler.schedule_every(every, :first_in => every) do
+      enqueue :miq_report_result_purge_timer
+    end
+
     # Schedule every 24 hours
     at = worker_settings[:storage_file_collection_time_utc]
     if Time.now.strftime("%Y-%m-%d #{at}").to_time(:utc) < Time.now.utc

config/settings.yml

@@ -1393,6 +1393,7 @@
       :policy_events_purge_interval: 1.day
       :poll: 15.seconds
       :resync_rhn_mirror: 12.hours
+      :report_result_purge_interval: 1.week
       :server_log_stats_interval: 5.minutes
       :server_stats_interval: 60.seconds
       :service_retired_interval: 10.minutes