Lubomir I. Ivanov 05b77fe99f kubeadm: warn but do not error out on missing CA keys on CP join ...

- Modify validateCACertAndKey() to print warnings for missing keys
instead of erroring out.
- Update unit tests.

This allows doing a CP node join in a case where the user has:
- copied shared certificates to the new CP node, but not copied
ca.key files, treating the cluster CAs as external
- signed other required certificates in advance

2020-09-24 18:11:59 +03:00

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