Merge branch 'master' into tags_download

cluster.yml

docs/ansible.md

docs/dns-stack.md

inventory/group_vars/all.yml

reset.yml

roles/dnsmasq/defaults/main.yml

roles/dnsmasq/tasks/dnsmasq.yml

roles/dnsmasq/tasks/main.yml

roles/dnsmasq/templates/01-kube-dns.conf.j2

roles/docker/handlers/main.yml

roles/etcd/meta/main.yml

roles/kubernetes-apps/ansible/defaults/main.yml

roles/kubernetes/node/meta/main.yml

roles/kubernetes/preinstall/defaults/main.yml

roles/kubernetes/preinstall/files/dhclient_nodnsupdate

roles/kubernetes/preinstall/handlers/main.yml

roles/kubernetes/preinstall/tasks/main.yml

roles/kubernetes/preinstall/tasks/resolvconf.yml

roles/kubernetes/preinstall/tasks/set_facts.yml

roles/kubernetes/preinstall/templates/resolvconf.j2