CoreDNS Lameduck Upgrades

MKE 4k supports upgrading from MKE 3 systems that are running with CoreDNS and Lameduck enabled. Refer to the table below for a comparison of the CoreDNS Lameduck configuration parameters between MKE 3 and MKE 4k:

MKE 3	MKE 4k
[cluster_config.core_dns_lameduck_config.enabled]	dns.lameduck.enabled
[cluster_config.core_dns_lameduck_config.duration]	dns.lameduck.duration