Fix DNS loop when resolvconf_mode is set to host_resolvconf (#3390)
* Fix DNS loop when resolvconf_mode is set to host_resolvconf * Make sure upstream_dns_servers is defined when using resolvconf_mode == 'host_resolvconf' * Only set upstream dns servers on KubeDNS and CoreDNS if they are defined * Only set upstream dns servers on KubeDNS and CoreDNS if they are defined
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