rebase: update kubernetes to v1.20.0

updated kubernetes packages to latest
release.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

vendor/k8s.io/kubernetes/pkg/proxy/util/endpoints.go

@@ -0,0 +1,74 @@
+/*
+Copyright 2017 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 util
+
+import (
+	"fmt"
+	"net"
+	"strconv"
+
+	"k8s.io/klog/v2"
+)
+
+// IPPart returns just the IP part of an IP or IP:port or endpoint string. If the IP
+// part is an IPv6 address enclosed in brackets (e.g. "[fd00:1::5]:9999"),
+// then the brackets are stripped as well.
+func IPPart(s string) string {
+	if ip := net.ParseIP(s); ip != nil {
+		// IP address without port
+		return s
+	}
+	// Must be IP:port
+	host, _, err := net.SplitHostPort(s)
+	if err != nil {
+		klog.Errorf("Error parsing '%s': %v", s, err)
+		return ""
+	}
+	// Check if host string is a valid IP address
+	ip := net.ParseIP(host)
+	if ip == nil {
+		klog.Errorf("invalid IP part '%s'", host)
+		return ""
+	}
+	return ip.String()
+}
+
+// PortPart returns just the port part of an endpoint string.
+func PortPart(s string) (int, error) {
+	// Must be IP:port
+	_, port, err := net.SplitHostPort(s)
+	if err != nil {
+		klog.Errorf("Error parsing '%s': %v", s, err)
+		return -1, err
+	}
+	portNumber, err := strconv.Atoi(port)
+	if err != nil {
+		klog.Errorf("Error parsing '%s': %v", port, err)
+		return -1, err
+	}
+	return portNumber, nil
+}
+
+// ToCIDR returns a host address of the form <ip-address>/32 for
+// IPv4 and <ip-address>/128 for IPv6
+func ToCIDR(ip net.IP) string {
+	len := 32
+	if ip.To4() == nil {
+		len = 128
+	}
+	return fmt.Sprintf("%s/%d", ip.String(), len)
+}