Fix 401 status response

Fixes Bug1153718

Change-Id: I18adefdc9cf6cadee6006e9352e872dfb4de7e1d

keystone/exception.py

@@ -111,7 +111,7 @@ class SecurityError(Error):
 class Unauthorized(SecurityError):
     """The request you have made requires authentication."""
     code = 401
-    title = 'Not Authorized'
+    title = 'Unauthorized'
 
 
 class AuthPluginException(Unauthorized):

tests/test_s3_token_middleware.py

@@ -159,7 +159,7 @@ class S3TokenMiddlewareTestBad(S3TokenMiddlewareTestBase):
             ret = {"error":
                    {"message": "EC2 access key not found.",
                     "code": 401,
-                    "title": "Not Authorized"}}
+                    "title": "Unauthorized"}}
             body = jsonutils.dumps(ret)
             self.status = 403
             self.resp = FakeHTTPResponse(self.status, body)