Specify namespace for nomad statistics job

SAS/TMSS/backend/services/qa_statistics_service/qa_statistics_service.py

@@ -142,7 +142,7 @@ class TMSSQAStatisticsServiceEventMessageHandler(TMSSEventMessageHandler):
 
         self.active_qa_subtasks = {}
 
-        self.dispatcher = JobDispatcher("statistics-aggregate")
+        self.dispatcher = JobDispatcher("statistics-aggregate", namespace="statistics")
 
         # Sense whether lingering jobs from previous runs are still active in nomad
         self.reconstruct_active_qa_subtasks()