Send events from kubelet.

Accept argument specifying file with kubernetes_auth file.
Make an api client in kubelet.
Send events to apiserver.
Factor to function.
Merge pull request #2270 from erictune/kubelet_publish_events

Kubelet publishes events
Kubelet talks securely to apiserver.

Configure apiserver to serve Securely on port 6443.
Generate token for kubelets during master VM startup.
Put token into file apiserver can get and another file the kubelets can get.