Replace the outdated cloudcfg.sh to kubecfg.sh

Replaces the outdated cloudcfg.sh to kubecfg.sh in the dynamic update demo.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Replace the outdated cloudcfg.sh to kubecfg.sh
Add validation of Volumes
Merge pull request #329 from thockin/valid6

Add validation of Volumes
Add basic validation of Containers