feat: allows users to have more control on DNS (#9270)

docs/dns-stack.md

docs/vars.md

inventory/sample/group_vars/k8s_cluster/k8s-cluster.yml

roles/kubernetes/preinstall/tasks/0040-set_facts.yml

roles/kubernetes/preinstall/tasks/0060-resolvconf.yml

...s/kubernetes/preinstall/tasks/0063-networkmanager-dns.yml

.../kubernetes/preinstall/templates/dhclient_dnsupdate.sh.j2

...bernetes/preinstall/templates/dhclient_dnsupdate_rh.sh.j2

roles/kubernetes/preinstall/templates/resolved.conf.j2