code: def create_vpn_gateway(self, type, availability_zone=None):
          
          params = {'Type' : type}
          if availability_zone:
              params['AvailabilityZone'] = availability_zone
          return self.get_object('CreateVpnGateway', params, VpnGateway)
docs: Create a new Vpn Gateway
  
          :type type: str
          :param type: Type of VPN Connection.  Only valid valid currently is 'ipsec.1'
  
          :type availability_zone: str
          :param availability_zone: The Availability Zone where you want the VPN gateway.
  
          :rtype: The newly created VpnGateway
          :return: A :class:`boto.vpc.vpngateway.VpnGateway` object