Updated openstack/openstack
Project: openstack/sahara  af0b8b7a5824b63966946f3b3d3b2971db0f8bd7

Workflow documentation is now in infra-manual

Replace URLs for workflow documentation to appropriate parts of the
OpenStack Project Infrastructure Manual.

Change-Id: I5ef5385a31f92ab0831e780c96b06da503106f9e