Retrieves a list of device definitions.Show details from next link. https://docs.aws.amazon.com/ja_jp/cli/latest/reference/greengrass/list-device-definitions.html
| aws greengrass list-device-definitions \ |
| ListDeviceDefinitions - AWS Greengrass : http://docs.aws.amazon.com/greengrass/latest/apireference/-greengrass-definition-devices.html |