code: @Override
      public ListVirtualMFADevicesResult listVirtualMFADevices(ListVirtualMFADevicesRequest request) {
          request = beforeClientExecution(request);
          return executeListVirtualMFADevices(request);
      }
docs: <p>
  Lists the virtual MFA devices defined in the AWS account by assignment status. If you do not specify an
  assignment status, the operation returns a list of all virtual MFA devices. Assignment status can be
  <code>Assigned</code>, <code>Unassigned</code>, or <code>Any</code>.
  </p>
  <p>
  You can paginate the results using the <code>MaxItems</code> and <code>Marker</code> parameters.
  </p>
  
  @param listVirtualMFADevicesRequest
  @return Result of the ListVirtualMFADevices operation returned by the service.
  @sample AmazonIdentityManagement.ListVirtualMFADevices
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/iam-2010-05-08/ListVirtualMFADevices" target="_top">AWS API
  Documentation</a>