Fluentd to Elasticsearch image

This pull request is for the sources needed to make the google/fluentd-elasticsearch image which is invoked by the manifest pod specification file which is installed when the user gives the --fluentd-es flag during cluster turn up to ask for this logging option.
The gateway worked worked for my bootstrap hack:
https://github.com/GoogleCloudPlatform/kubernetes/pull/1716/files#diff-14da3738142f38850fb7acf7aafb6f80R18

@thockin when you say you don't want coupling with the outer host, can you expand a little bit more? Do you expect the ip of the kubelet managing a given pod to change during the lifetime of the container?