Fix lookup of linked containers for API version 1.20

Signed-off-by: Daniel Nephin <dnephin@docker.com>

compose/container.py

@@ -228,16 +228,6 @@ class Container(object):
         self.has_been_inspected = True
         return self.dictionary
 
-    # TODO: only used by tests, move to test module
-    def links(self):
-        links = []
-        for container in self.client.containers():
-            for name in container['Names']:
-                bits = name.split('/')
-                if len(bits) > 2 and bits[1] == self.name:
-                    links.append(bits[2])
-        return links
-
     def attach(self, *args, **kwargs):
         return self.client.attach(self.id, *args, **kwargs)