when deploy fs, set config option "lbaas_vip_create_port" to True

After deployed fs, when doing config for fs, need to set config option of neutron-server 'lbaas_vip_create_port'
to True.
def config_neutron_server(self):
        updated_params = {'lbaas_vip_create_port':'True'}
        service = 'neutron'
        template = 'neutron-server'
        self._update_template_params_for_proxy(service, template, updated_params)
        self._commit_config()