code: @Override
      public UpdateSigningCertificateResult updateSigningCertificate(UpdateSigningCertificateRequest request) {
          request = beforeClientExecution(request);
          return executeUpdateSigningCertificate(request);
      }
docs: <p>
  Changes the status of the specified user signing certificate from active to disabled, or vice versa. This
  operation can be used to disable an IAM user's signing certificate as part of a certificate rotation work flow.
  </p>
  <p>
  If the <code>UserName</code> field is not specified, the user name is determined implicitly based on the AWS
  access key ID used to sign the request. This operation works for access keys under the AWS account. Consequently,
  you can use this operation to manage AWS account root user credentials even if the AWS account has no associated
  users.
  </p>
  
  @param updateSigningCertificateRequest
  @return Result of the UpdateSigningCertificate operation returned by the service.
  @throws NoSuchEntityException
  The request was rejected because it referenced a resource entity that does not exist. The error message
  describes the resource.
  @throws LimitExceededException
  The request was rejected because it attempted to create resources beyond the current AWS account limits.
  The error message describes the limit exceeded.
  @throws ServiceFailureException
  The request processing has failed because of an unknown error, exception or failure.
  @sample AmazonIdentityManagement.UpdateSigningCertificate
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/iam-2010-05-08/UpdateSigningCertificate" target="_top">AWS
  API Documentation</a>