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/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1/deepcopy.go

@@ -234,5 +234,31 @@ func (in *JSONSchemaProps) DeepCopy() *JSONSchemaProps {
 		}
 	}
 
+	if in.XPreserveUnknownFields != nil {
+		in, out := &in.XPreserveUnknownFields, &out.XPreserveUnknownFields
+		if *in == nil {
+			*out = nil
+		} else {
+			*out = new(bool)
+			**out = **in
+		}
+	}
+
+	if in.XListMapKeys != nil {
+		in, out := &in.XListMapKeys, &out.XListMapKeys
+		*out = make([]string, len(*in))
+		copy(*out, *in)
+	}
+
+	if in.XListType != nil {
+		in, out := &in.XListType, &out.XListType
+		if *in == nil {
+			*out = nil
+		} else {
+			*out = new(string)
+			**out = **in
+		}
+	}
+
 	return out
 }