The CoreDNS GA feature-gate in kubeadm was deprecated since 1.13.
The k8s policy is to remove the gate 2 releases after it transitions
to GA:
https://kubernetes.io/docs/reference/using-api/deprecation-policy/#deprecation
We kept it around for longer to prevent existing setups from breaking
as it caused minimal maintenance overhead.
Fix a couple of problems related to data used by the phases runners
of `init` and `join`.
1) make `newInitData()` and `newJoinData()` return pointers.
Methods of the data objects returned by these functions should
be able to modify fields in the data objects - e.g.
`func (d initData) Client()`. This allows us to store a state and
not execute the same logic multiple times - e.g. obtaining a client.
A side effect of this change is that the `new...` functions must return
pointers, so that casting the data object in a phase, from
`workflow.RunData` to a locally defined interface, works.
2) Make it possible to pass arguments from a parent command
to a sub-phase with regards to data initialization.
