add versioning magic to index.rst

[jputrino]

I need to add @swormke's versioning voodoo (below) to index.rst so it's easy to identify to what version(s) of OpenStack a doc set applies. (needs to be done per branch)

Releases and Versions

|release| supports the OpenStack |openstack| release. For more information about F5 Networks's OpenStack versioning and a support matrix please see F5 Networks OpenStack Support Matrix <https://F5Networks.github.io/f5-openstack-docs>__."

in the config.py file you just need to add the following:

openstack_release = "Kilo"
rst_epilog = """
.. |openstack| replace:: {0}
""".format(openstack_release)

[jputrino]

Fixed by #53 and #54.