Creates a new VPN service

def create_vpnservice(self, subnet, router, name, admin_state_up=True):
        '''
        Creates a new VPN service
        '''
        subnet_id = self._find_subnet_id(subnet)
        router_id = self._find_router_id(router)
        body = {'subnet_id': subnet_id,
                'router_id': router_id,
                'name': name,
                'admin_state_up': admin_state_up}
        return self.network_conn.create_vpnservice(body={'vpnservice': body})