This patch enables building .pdf documentation using new 'pdf-docs'
tox environment. The newly created tox environment creates latex
source codes using sphinx-build and then builds the pdf
documentation using make.
The patch also fixes documentation to reflect change from openstack
to osf organization fixes copy-paste mistakes in the doc configs.
Change-Id: I15a03442c2a2c355c8e7f1658c1b2329eb38c7df
e8fac460b8