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-apps/network_plugin/weave/tasks/main.yml

@@ -1,15 +1,4 @@
 ---
-# FIXME: remove if kubernetes/features#124 is implemented
-- name: Weave | Purge old weave daemonset
-  kube:
-    name: "weave-net"
-    kubectl: "{{ bin_dir }}/kubectl"
-    filename: "{{ kube_config_dir }}/weave-net.yml"
-    resource: "ds"
-    namespace: "{{system_namespace}}"
-    state: absent
-  when: inventory_hostname == groups['kube-master'][0] and weave_manifest.changed
-
 - name: Weave | Start Resources
   kube:
     name: "weave-net"