Add some conditions for always-send and never-send event types

Always send websocket messages for
  high priority events like playbook_on_stats

Never send websocket messages for
  events with no output
  unless they are a high priority event type

awx/main/models/events.py

@@ -17,6 +17,7 @@ from awx.api.versioning import reverse
 from awx.main import consumers
 from awx.main.managers import DeferJobCreatedManager
 from awx.main.fields import JSONField
+from awx.main.constants import MINIMAL_EVENTS
 from awx.main.models.base import CreatedModifiedModel
 from awx.main.utils import ignore_inventory_computed_fields, camelcase_to_underscore
 
@@ -57,9 +58,6 @@ def create_host_status_counts(event_data):
     return dict(host_status_counts)
 
 
-MINIMAL_EVENTS = set(['playbook_on_play_start', 'playbook_on_task_start', 'playbook_on_stats', 'EOF'])
-
-
 def emit_event_detail(event):
     if settings.UI_LIVE_UPDATES_ENABLED is False and event.event not in MINIMAL_EVENTS:
         return