Implements new interface for Kubernetes VIM to handle Helm chart.
It enables Users to include Helm chart files as MCIOP in their VNF
Packages, to instantiate and to terminate CNF with them.
And update sample of MgmtDriver to install and configure Helm package
for using Helm cli command in the deployed Kubernetes cluster VNF, and
to restore the registered helm repositories and charts after the master
node is healed.
Implements: blueprint helmchart-k8s-vim
Change-Id: I8511b103841d5aba7edcf9ec5bb974bfa3a74bb2
08ae05a27a