
Add a new tox target to build PDF documentation in accord with the community goal [0] to have PDF docs available. Also, only show genindex and search for HTML. These elements do not make sense within PDF documents. [0] https://governance.openstack.org/tc/goals/selected/train/pdf-doc-generation.html Change-Id: Ibbd50276c3879958b0ceb82afcc882716c01b384