Correct path in request logging

The path didn't include the version (e.g., /v3), so you might not
be able to tell if it's a v2 or v3 request.

Change-Id: I3e66a4662ff0966841b83efcc20f169b8485aa11

keystone/common/wsgi.py

@@ -228,9 +228,10 @@ def __call__(self, req):
         # response code between GET and HEAD requests. The HTTP status should
         # be the same.
         req_method = req.environ['REQUEST_METHOD'].upper()
+        path = req.environ.get('RAW_PATH_INFO') or req.environ['PATH_INFO']
         LOG.info('%(req_method)s %(path)s%(params)s', {
             'req_method': req_method,
-            'path': context['path'],
+            'path': path,
             'params': '?' + urllib.urlencode(req.params) if req.params else ''}
         )