devices: add todos to ensure the open questions get done

devices/org.osbuild.lvm2.lv

@@ -175,7 +175,7 @@ class LVService(devices.DeviceService):
 
         return major, minor
 
-    def open(self, devpath: str, parent: str, tree: str, options: Dict):
+    def open(self, devpath: str, parent: str, tree: str, options: Dict) -> None:
         lv = options["volume"]
 
         assert not parent.startswith("/")
@@ -186,6 +186,9 @@ class LVService(devices.DeviceService):
 
         # Find the volume group that belongs to the device specified
         # via `parent`
+        # XXX: does parent_path already needs changing above for
+        # manage_devices_files?
+        # XXX2: add test
         part = options.get("vg_partition")
         if part:
             parent_path += f"p{part}"