Convert V2's manifest endpoints to use the new data model interface

data/registry_model/interface.py

@@ -117,6 +117,12 @@ class RegistryDataInterface(object):
     or None if none.
     """
 
+  @abstractmethod
+  def has_expired_tag(self, repository_ref, tag_name):
+    """
+    Returns true if and only if the repository contains a tag with the given name that is expired.
+    """
+
   @abstractmethod
   def retarget_tag(self, repository_ref, tag_name, manifest_or_legacy_image,
                    is_reversion=False):