Update docs building:
* Switch to sphinx-build
* Update requirements for Sphinx and openstackdocstheme for
python 3
* Remove unneeded doc and translation sections from setup.cfg
* Remove install_command, it's unneeded, the default is fine.
Change-Id: I5678058e43df7e708c7aefd7c06431ab21415e34
This tempest plugin is being split out of the main monasca project in
accordance with Queens goal "Split Tempest Plugins into Separate
Repos/Projects"[1]. This patch applies the standard boilerplate files
for OpenStack projects so that it can stand on its own.
[1] https://governance.openstack.org/tc/goals/queens/split-tempest-plugins.html