Filter nodes based on pods selectors

[moadqassem]

This PR solves the issue of network traffic forwarding from the load balancer service to the right nodes where the pods that are selected are running. When the externalTrafficPolicy Local is used, then traffic would be only go south-west not east-west which means, if the traffic goes to a node where the selected pod doesn't exists, this request will fail.

Fixes #41

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