Use openstack-doc-tools for openstack-operations-guide-{lang}

Do not use maven anymore, use tox to build and publish everything.
The buildlang tox job will call maven and publish everything to
published-docs/{lang}.

Change-Id: I2dd656d5c16e4eddf19c1d84c09c6f46c901cdd8
Merge "Use openstack-doc-tools for openstack-operations-guide-{lang}"