Updated openstack/openstack
Project: openstack/python-keystoneclient  b63bd9c3d8c1f47a9354242eaee196713edde01f
null
Docs link to middlewarearchitecture

There was no link to the middleware architecture from the main
page so nobody would know that it's there. This adds the link.

Change-Id: I2cd7a458b48d2c2889e4305e01bc013796a67c6e