Fix bug in azure machinery when gathering relevant machines

Author: ChrisThibodeaux

modules/machinery/az.py

@@ -1215,7 +1215,7 @@ def _get_relevant_machines(self, tag):
         """
         # The number of relevant machines are those from the list of locked and unlocked machines
         # that have the correct tag in their name
-        return [machine for machine in self.db.list_machines([tag])]
+        return [machine for machine in self.db.list_machines(tags=[tag])]
 
     @staticmethod
     def _wait_for_concurrent_operations_to_complete(timeout=AZURE_TIMEOUT):