Deploy kubelet and kube-apiserver as containers

kubelet via docker
kube-apiserver as a static pod

Fixed etcd service start to be more tolerant of slow start.

Workaround for kube_version to stay in download role, but not
download an files by creating a new "nothing" download entry.

roles/kubernetes/master/meta/main.yml

@@ -2,7 +2,5 @@
 dependencies:
   - role: download
     file: "{{ downloads.kubernetes_kubectl }}"
-  - role: download
-    file: "{{ downloads.kubernetes_apiserver }}"
   - { role: etcd }
   - { role: kubernetes/node }