Updated openstack/openstack
Project: openstack/keystonemiddleware  b4ac5db7e0da37c64a5e4d801ae10033e6ec2661

Remove HTTP_X_STORAGE_TOKEN doc

This header isn't referenced in the code so remove it from the
documentation.

Change-Id: I77c5432d4d7a31422c75f9d675ec0e15f6c1164d