Add support for status change in Document.get_file_path, ideally

someone would clean up the directory structure and we would transition
to something simpler
 - Legacy-Id: 6409

ietf/doc/models.py

@@ -80,6 +80,8 @@ class DocumentInfo(models.Model):
             return settings.CHARTER_PATH
         elif self.type_id == "conflrev": 
             return settings.CONFLICT_REVIEW_PATH
+        elif self.type_id == "statchg":
+            return settings.STATUS_CHANGE_PATH
         else:
             raise NotImplemented