Merge pull request #676 from dod-ccpo/to-edit-sign-permissions

Break KO signing  into two steps

atst/domain/task_orders.py

@@ -120,6 +120,10 @@ class TaskOrders(object):
 
         return True
 
+    @classmethod
+    def is_signed_by_ko(cls, task_order):
+        return task_order.signer_dod_id is not None
+
     @classmethod
     def mission_owner_sections(cls):
         section_list = TaskOrders.SECTIONS