private static void KeystoneListGroups(IamClient iamClient)
        {
            var keystoneListGroupsRequest = new KeystoneListGroupsRequest()
            {
                DomainId = "",
                Name     = ""
            };

            try
            {
                var keystoneListGroupsResponse = iamClient.KeystoneListGroups(keystoneListGroupsRequest);
                foreach (var group in keystoneListGroupsResponse.Groups)
                {
                    Console.WriteLine(JsonConvert.SerializeObject(group));
                }
            }
            catch (RequestTimeoutException requestTimeoutException)
            {
                Console.WriteLine(requestTimeoutException.ErrorMessage);
            }
            catch (ServiceResponseException clientRequestException)
            {
                Console.WriteLine(clientRequestException.HttpStatusCode);
                Console.WriteLine(clientRequestException.ErrorCode);
                Console.WriteLine(clientRequestException.ErrorMsg);
            }
            catch (ConnectionException connectionException)
            {
                Console.WriteLine(connectionException.ErrorMessage);
            }
        }