add analytics ping on /new hit

[philips]

We have logs from discovery.etcd.io everytime someone creates a new cluster but just for archival metrics it would be nice if we got a google analytics ping too.

[philips]

ID: UA-42684979-8
Domain: http://controllers.coreos.com (you shouldn’t need this, its a dummy value since this isn’t a website)

Let’s submit events in this format:

Category: "discovery-etcd-controller”
Action: “new-cluster”