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/client-go/util/jsonpath/node.go

@@ -130,8 +130,9 @@ func (f *IdentifierNode) String() string {
 
 // ParamsEntry holds param information for ArrayNode
 type ParamsEntry struct {
-	Value int
-	Known bool // whether the value is known when parse it
+	Value   int
+	Known   bool // whether the value is known when parse it
+	Derived bool
 }
 
 // ArrayNode holds start, end, step information for array index selection