kubeadm.conf syntax validation

[enp0s3]

Is your feature request related to a problem? Please describe:
It is hard to remember the format of kubeadm.conf, one can use wrong syntax and find it out
only at the last stages of the provision, when testing it locally.

Describe the solution you'd like:
If possible lets add syntax validation for the kubeadm.conf file, ,maybe its possible to use
containerized kubeadm with dry run option.