Fix for _PushStatus Stuck 'running' when Count is Off (#4319)

* Fix for _PushStatus stuck 'running' if count is off

* use 'count' for batches

* push worker test fix

src/Controllers/SchemaController.js

@@ -88,7 +88,7 @@ const defaultColumns = Object.freeze({
     "failedPerType":       {type:'Object'},
     "sentPerUTCOffset":    {type:'Object'},
     "failedPerUTCOffset":  {type:'Object'},
-    "count":               {type:'Number'}
+    "count":               {type:'Number'} // tracks # of batches queued and pending
   },
   _JobStatus: {
     "jobName":    {type: 'String'},