Describes the cause and action for error messages.
Error Message(English)：
invalid choice eks
Shiped AWS CLI doesn't know EKS service ・ Issue #14 ・ awslabs ...
https://github.com/awslabs/amazon-eks-ami/issues/14
ops-cli/examples/aws-kubernetes at master ・ adobe/ops-cli ・ GitHub
https://github.com/adobe/ops-cli/tree/master/examples/aws-kubernetes