use istio client-go library instead of knative (#1661)

use istio client-go library instead of knative
bump kubernetes dependency version
change code coverage to codecov

vendor/k8s.io/gengo/namer/order.go

@@ -43,6 +43,9 @@ func (o *Orderer) OrderUniverse(u types.Universe) []*types.Type {
 		for _, v := range p.Variables {
 			list.types = append(list.types, v)
 		}
+		for _, v := range p.Constants {
+			list.types = append(list.types, v)
+		}
 	}
 	sort.Sort(list)
 	return list.types