'Create the list of attributes required by policy.
If the attribute map contains a tenant_id policy, then include
project_id to bring the resource into the brave new world.
:return: sorted list of attributes required by policy'

def _init_policy_attrs(self):

    policy_attrs = {name for (name, info) in self._attr_info.items() if info.get('required_by_policy')}
    if ('tenant_id' in policy_attrs):
        policy_attrs.add('project_id')
    return sorted(policy_attrs)
