Renamed sitemap file to avoid module name conflict
when importing at the sitemap unittest
Added py.test tox environment
openstack-doc-test is used for building of DocBook XML files. For index
page generation openstack-indexpage can be used.
Remove openstack-doc-test together with all support files.
Add information about hacking and testing the repository.
HACKING.rst is a convention used by OpenStack python packages,
let's use it here as well.