mw/kubernetes: remove kService and kPod

Remove the intermediate step of gathering everyhing in a kPod and
kService and extracting the msg.Service from there. Now findPods and
findServices return []msg.Service.

This cuts down on the code and also removed the double looping of
finding the data we need, so it should be faster.

middleware/kubernetes/parse.go

@@ -26,7 +26,7 @@ type recordRequest struct {
 // parseRequest parses the qname to find all the elements we need for querying k8s. Anything
 // that is not parsed will have the wildcard "*" value (except r.endpoint).
 // Potential underscores are stripped from _port and _protocol.
-func (k *Kubernetes) parseRequest(state request.Request) (r recordRequest, err error) {
+func parseRequest(state request.Request) (r recordRequest, err error) {
 	// 3 Possible cases:
 	// 1. _port._protocol.service.namespace.pod|svc.zone
 	// 2. (endpoint): endpoint.service.namespace.pod|svc.zone