Drop non systemd OS types support

inventory/group_vars/all.yml

roles/docker/handlers/main.yml

roles/docker/tasks/main.yml

roles/docker/tasks/non-systemd.yml

roles/etcd/handlers/main.yml

roles/etcd/tasks/configure.yml

roles/etcd/templates/deb-etcd-docker.initd.j2

roles/etcd/templates/deb-etcd-host.initd.j2

roles/kubernetes/master/handlers/main.yml

roles/kubernetes/node/handlers/main.yml

roles/kubernetes/node/tasks/install.yml

roles/kubernetes/node/templates/deb-kubelet.initd.j2

roles/kubernetes/node/templates/kubelet.j2

roles/kubernetes/node/templates/rh-kubelet.initd.j2

roles/kubernetes/preinstall/tasks/main.yml

roles/kubernetes/preinstall/tasks/pre-upgrade.yml

roles/network_plugin/calico/handlers/main.yml

roles/network_plugin/calico/rr/handlers/main.yml

roles/network_plugin/calico/rr/tasks/main.yml

roles/network_plugin/calico/tasks/main.yml