Retrieves the current configuration for the CA used by the group.Show details from next link. https://docs.aws.amazon.com/ja_jp/cli/latest/reference/greengrass/get-group-certificate-configuration.html
| aws greengrass get-group-certificate-configuration \ |
| UpdateGroupCertificateConfiguration - AWS Greengrass : http://docs.aws.amazon.com/greengrass/latest/apireference/-greengrass-groups-groupid-certificateauthorities-configuration-expiry.html |