fixed some small things when working with vsphere provisioner

[aSauerwein]

1. prepend cluster name to nodepool to make them unique. ( otherwise you cannot name your node pool 'cpl' across 2 clusters )
2. add option to define machineselectorconfig ( for example for system registry settings )
3. add registries / mirrors
4. add node pool os to deploy windows node pools
5. vapp properties should be a list
6. cfgparam should also be a list