获取VPN网关详情 类型ssl:ssl类型ipsec,ssl:ipsec+ssl类型 ipsec vpcName 否 String vpc名称 vpc-9ce5 vpcID 否 String vpc ID vpc-6jwowr794e localSubnets 否 Array of Objects 子网信息 "localSubnets":[{"subnetID":"subnet-a0l1wqi058","subnetName":"subnet-9ce5","cidr":"10.112.0.0/24"