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Add sequence diagrams generated by sphinxcontrib-seqdiag along with the raw text that generated then, so that it can be updated easily later. The diagrams were created originally by Devananda van der Veen, and used in OpenStack Summit YVR. Ref) * https://www.openstack.org/summit/vancouver-2015/summit-videos /presentation/isn-and-039t-it-ironic-the-bare-metal-cloud * http://devananda.github.io/talks/isnt-it-ironic.html Change-Id: I47ff02c6cb4764c1740d0924668714ed205b3d9b