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

def create_vpn_gateway(self, type, availability_zone=None):
        """
        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
        """
        params = {'Type' : type}
        if availability_zone:
            params['AvailabilityZone'] = availability_zone
        return self.get_object('CreateVpnGateway', params, VpnGateway)