For multi-node clusters store the kubeconfig and RSA_Pub files on a CSV

**Title**: For multi-node clusters store the kubeconfig and RSA_Pub files on a CSV

**Description**:
For multi-node deployments, a number of critical config files and ssh keys are stored on the local HCI node that the Install-AksHci command was run on (e.g. kubeconfig in c:\wssd)

These critical config files should be stored on a CSV by default. If the node that the install was performed on crashed / re-installed etc. this could lock out the unsuspecting admin for AKS cluster management.

The user should be made aware of the security implications.