Refactor go packages

core/pkg/net/net.go

@@ -1,24 +0,0 @@
-/*
-Copyright 2015 The Kubernetes Authors.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-package net
-
-import _net "net"
-
-// IsIPV6 checks if the input contains a valid IPV6 address
-func IsIPV6(ip _net.IP) bool {
-	return ip.To4() == nil
-}