Update to docker-py 0.3.1

From 7f55a101f8

This now requires Docker 0.9 or greater.

fig/packages/docker/auth/auth.py

@@ -48,7 +48,7 @@ def resolve_repository_name(repo_name):
         raise ValueError('Repository name cannot contain a '
                          'scheme ({0})'.format(repo_name))
     parts = repo_name.split('/', 1)
-    if not '.' in parts[0] and not ':' in parts[0] and parts[0] != 'localhost':
+    if '.' not in parts[0] and ':' not in parts[0] and parts[0] != 'localhost':
         # This is a docker index repo (ex: foo/bar or ubuntu)
         return INDEX_URL, repo_name
     if len(parts) < 2:
@@ -87,6 +87,11 @@ def resolve_authconfig(authconfig, registry=None):
     return authconfig.get(swap_protocol(registry), None)
 
 
+def encode_auth(auth_info):
+    return base64.b64encode(auth_info.get('username', '') + b':' +
+                            auth_info.get('password', ''))
+
+
 def decode_auth(auth):
     if isinstance(auth, six.string_types):
         auth = auth.encode('ascii')
@@ -100,6 +105,12 @@ def encode_header(auth):
     return base64.b64encode(auth_json)
 
 
+def encode_full_header(auth):
+    """ Returns the given auth block encoded for the X-Registry-Config header.
+    """
+    return encode_header({'configs': auth})
+
+
 def load_config(root=None):
     """Loads authentication data from a Docker configuration file in the given
     root directory."""