Restore k0s spec.api.sans updating that was removed in #772 #783
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Fixes #782
Closes k0sproject/k0s#5157 (skip v0.19.2 bump)
Brings back and improves the k0s config
spec.api.sans
manipulation that was removed in #772 commit fd0ba50 - turns out adding at least the controller's public address is required as k0s will not always get it fromiface.AllAddresses()
(NAT, fqdn, etc). Also restored the adding of the addresses of all the other controllers.Now a single list of SANs is built globally just once and it should be identical between controllers. The list includes the addresses and possibly private addresses of all controllers.