status 403 Not Authorized is not valid

Keystone responds to some requests with a status line of 403 Not Authorized. This is not valid HTTP. The status text for 403 should be Forbidden, see http://tools.ietf.org/html/rfc2616#section-10.4.4

Here's an example:

 $ curl -i -H "X-Auth-Token: $DEMO_TOKEN" http://localhost:5000/v3/projects ; echo
 HTTP/1.1 403 Not Authorized
 Vary: X-Auth-Token
 Content-Type: application/json
 Content-Length: 144
 Date: Sat, 09 Mar 2013 23:12:28 GMT

 {"error": {"message": "You are not authorized to perform the requested action: identity:list_projects", "code": 403, "title": "Not Authorized"}}

This should be:

$ curl -i -H "X-Auth-Token: $DEMO_TOKEN" http://localhost:5000/v3/projects ; echo
HTTP/1.1 403 Forbidden
Vary: X-Auth-Token
Content-Type: application/json
Content-Length: 144
Date: Sat, 09 Mar 2013 23:12:28 GMT

{"error": {"message": "You are not authorized to perform the requested action: identity:list_projects", "code": 403, "title": "Forbidden"}}