Verify network

This adds a simple go server and service/replicationController description files that will be used to verify network connectivity.

It's pretty easy to use: in pseudo-bash:

```
kubectl create -f service.json
kubectl create -f rc.json
while `curl https://admin:password@146.148.85.136/api/v1beta1/proxy/services/nettest/status` == "running";
passed=`curl https://admin:password@146.148.85.136/api/v1beta1/proxy/services/nettest/status` == "pass"
delete rc
delete service
```

Additional info can be found by doing ```curl https://admin:password@146.148.85.136/api/v1beta1/proxy/services/nettest/read```

I'll package that up in an actual test file later.

@thockin this could benefit from your daemonController, as much as I hate to admit it...
nit: preference for yaml files, but don't care that much.