Implement support for service_tokens. For that we convert
role_name to be a list along with renaming corresponding variable.
Additionally service_type is defined now for keystone_authtoken which
enables to validate tokens with restricted access rules
Depends-On: https://review.opendev.org/c/openstack/openstack-ansible-plugins/+/845690
Change-Id: If34e0170ea0e0f7727cfadba982f3c7dae6ae216