Fixes #150. properly sets schema when priority present.

Author: arlake228

psconfig/perfsonar-psconfig/psconfig/client/pscheduler/task.py

@@ -375,7 +375,7 @@ def add_local_lead_bind_map(self, bind=None):
     def post_task(self):
 
         if self.schema() is None:
-            if self.priority() is None:
+            if self.priority() is not None:
                 #priority introduced in v3
                 self.schema(3)
             elif self.contexts():