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Implement regions discovery in kostyor-openstack-ansible driver.
Region name is stored in 'service_region' OSA variable. If it wasn't
overriden in /etc/openstack_deploy we can fetch it via ansible.vars.VariableManager.
Otherwise we need to lookup 'service_region' in /etc/openstack_deploy files.
Discovery driver relies on the fact that separate OpenStack region
is a separate ansible deployment.