Replace the outdated cloudcfg.sh to kubecfg.sh

Replaces the outdated cloudcfg.sh to kubecfg.sh in the dynamic update demo.
Merge pull request #332 from thagikura/patch-1

Replace the outdated cloudcfg.sh to kubecfg.sh
Describe identifiers in Kubernetes

Documents #199
Add validation of Volumes
Merge pull request #329 from thockin/valid6

Add validation of Volumes
Merge pull request #334 from smarterclayton/add_identifier_doc

Describe identifiers in Kubernetes
Add basic validation of Containers
Add validation for Container.Env

This includes backwards compat with the older "key" field.