Replace map/filter lambda with comprehensions

List comprehensions and generator expressions are considered to be more
Pythonic (and usually more readable) than map and filter with lambda.
This patch replaces four usages of [map|filter](lambda ...) with the
appropriate list comprehension or generator expression.

TrivialFix

Change-Id: Ifda9030bb8aa196cb7a5977a57ef46dfefd70fa6

watcher/api/middleware/auth_token.py

@@ -52,8 +52,8 @@ class AuthTokenMiddleware(auth_token.AuthProtocol):
         # The information whether the API call is being performed against the
         # public API is required for some other components. Saving it to the
         # WSGI environment is reasonable thereby.
-        env['is_public_api'] = any(map(lambda pattern: re.match(pattern, path),
-                                       self.public_api_routes))
+        env['is_public_api'] = any(re.match(pattern, path)
+                                   for pattern in self.public_api_routes)
 
         if env['is_public_api']:
             return self._app(env, start_response)