Fix secrets repr issue

- Change id_attribute to Id
- add new property id
- add name fallback

Fixes docker#2025

docker/models/secrets.py

@@ -4,14 +4,26 @@
 
 class Secret(Model):
     """A secret."""
-    id_attribute = 'ID'
+    id_attribute = 'Id'
 
     def __repr__(self):
         return "<%s: '%s'>" % (self.__class__.__name__, self.name)
 
+    @property
+    def id(self):
+        return self.attrs[Secret.id_attribute]
+
     @property
     def name(self):
-        return self.attrs['Spec']['Name']
+        """
+        Create secret only returns Id field, so if the name field is not
+        present, it will show id value instead.
+        Issue #2025
+        """
+        if self.attrs.get('Spec', {}).get('Name'):
+            return self.attrs['Spec']['Name']
+
+        return self.id
 
     def remove(self):
         """