Upgrade to kubeadm (#1667)

* Enable upgrade to kubeadm

* fix kubedns upgrade

* try upgrade route

* use init/upgrade strategy for kubeadm and ignore kubedns svc

* Use bin_dir for kubeadm

* delete more secrets

* fix waiting for terminating pods

* Manually enforce kube-proxy for kubeadm deploy

* remove proxy. update to kubeadm 1.8.0rc1

roles/kubernetes/master/tasks/kubeadm-migrate-certs.yml

@@ -0,0 +1,12 @@
+---
+- name: Copy old certs to the kubeadm expected path
+  copy:
+    src: "{{ kube_cert_dir }}/{{ item.src }}"
+    dest: "{{ kube_cert_dir }}/{{ item.dest }}"
+    remote_src: yes
+  with_items:
+    - {src: apiserver.pem, dest: apiserver.crt}
+    - {src: apiserver.pem, dest: apiserver.key}
+    - {src: ca.pem, dest: ca.crt}
+    - {src: ca-key.pem, dest: ca.key}
+  register: kubeadm_copy_old_certs