refactor xDS components to not require kubeconfig

[michelleN]

Currently, we're passing the kube config file to generate a kubernetes client within each xDS component that it can communicate with the Kubernetes api server. There are ways of generating a client without passing in a kube config file. We'll need to mount a service account to each xDS pod so that it can authenticate inside the cluster like shown here.

[asridharan]

@michelleN could you add a description to the issue?

Would this get resolved automatically by #96 ?

[michelleN]

@asridharan - added a description. I don't believe it will be automatically resolved via #96 bc we could technically continue on even with the aggregated discovery service using the kube config. However, this solution can be integrated during that refactor.

[michelleN]

resolved via #270