mw/kubernetes: remove kPod and kServices (#969)

Based up on: #939, but redone in a new PR with some cherry-picked
commits:
aacb91ef0b
5dc34247b7

This removes kPod and Kservice and creates []msg.Service from k.findPods
and k.findServices.

Updated few tests which I *think* are correct; they look correct to me.

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