Enable hcsctl create-inventory to create sample yaml files for additional use cases

[hbinkim]

Currently hcsctl create-inventory only generates sample yaml files for production use case which is for using public network and k8s cluster is installed with more than 3 nodes. So to install hypercloud-sds with hcsctl for private network, separate binary is used. It's ideal for one hcsctl binary to generate yaml files suits for following use cases: production, test (k8s cluster less than 3 nodes), minikube, and private network.

• Add sample yamls for minikube environment
• Add sample yamls for private network environment
• Add parameter such as -e or --env for hcsctl create-inventory to generate sample yamls depends on user input