Log user info in auth_token middleware

Add logging for user information (like user name, tenant_id, roles) in
the auth_token middleware. This would make tracking down issues much
easier.

Change-Id: Ife4ce29d2f8e1a338a025dda4afbd7b563f6b8c1
Implements: blueprint user-info-logging-in-auth-token-middleware

keystoneclient/middleware/auth_token.py

@@ -900,6 +900,9 @@ class AuthProtocol(object):
             'X-Role': roles,
         }
 
+        self.LOG.debug("Received request from user: %s with project_id : %s"
+                       " and roles: %s ", user_id, project_id, roles)
+
         try:
             catalog = catalog_root[catalog_key]
             rval['X-Service-Catalog'] = jsonutils.dumps(catalog)