Namechange events_processed -> event_processing_finished

from PR review, also adding tests to assert that the
value is passed from the stdout_handle to the UnifiedJob
object on finalization of job run in tasks.py

awx/api/views.py

@@ -145,7 +145,7 @@ class UnifiedJobDeletionMixin(object):
         # Still allow deletion of new status, because these can be manually created
         if obj.status in ACTIVE_STATES and obj.status != 'new':
             raise PermissionDenied(detail=_("Cannot delete running job resource."))
-        elif not obj.events_processed:
+        elif not obj.event_processing_finished:
             # Prohibit deletion if job events are still coming in
             if obj.finished and now() < obj.finished + dateutil.relativedelta.relativedelta(minutes=1):
                 # less than 1 minute has passed since job finished and events are not in