implement ippool

1. support vlan ippool management
2. support calico ippool management

Signed-off-by: Duan Jiong <djduanjiong@gmail.com>

pkg/simple/client/network/utils/utils.go

@@ -0,0 +1,37 @@
+/*
+Copyright 2020 The KubeSphere 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 utils
+
+import (
+	"fmt"
+	"math/rand"
+	"net"
+)
+
+func EthRandomAddr(ip net.IP) string {
+	buf := make([]byte, 2)
+	rand.Read(buf)
+
+	// Clear multicast bit
+	buf[0] &= 0xfe
+	// Set the local bit
+	buf[0] |= 2
+
+	//TODO support ipv6
+	buf = append(buf, []byte(ip)...)
+	return fmt.Sprintf("%02x:%02x:%02x:%02x:%02x:%02x", buf[0], buf[1], buf[2], buf[3], buf[4], buf[5])
+}