Make binary file and directory name consistent

This change make binary file and directory name consistent.
In addition, change the package name cni to server because cni
is a bit umbiguous for cni plugin's repository.

cmd/multus/main.go

@@ -0,0 +1,59 @@
+// Copyright (c) 2017 Intel Corporation
+//
+// 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.
+
+// This is a "Multi-plugin".The delegate concept referred from CNI project
+// It reads other plugin netconf, and then invoke them, e.g.
+// flannel or sriov plugin.
+
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+
+	"github.com/containernetworking/cni/pkg/skel"
+	cniversion "github.com/containernetworking/cni/pkg/version"
+	"gopkg.in/k8snetworkplumbingwg/multus-cni.v3/pkg/multus"
+)
+
+func main() {
+
+	// Init command line flags to clear vendored packages' one, especially in init()
+	flag.CommandLine = flag.NewFlagSet(os.Args[0], flag.ExitOnError)
+
+	// add version flag
+	versionOpt := false
+	flag.BoolVar(&versionOpt, "version", false, "Show application version")
+	flag.BoolVar(&versionOpt, "v", false, "Show application version")
+	flag.Parse()
+	if versionOpt == true {
+		fmt.Printf("%s\n", multus.PrintVersionString())
+		return
+	}
+
+	skel.PluginMain(
+		func(args *skel.CmdArgs) error {
+			result, err := multus.CmdAdd(args, nil, nil)
+			if err != nil {
+				return err
+			}
+			return result.Print()
+		},
+		func(args *skel.CmdArgs) error {
+			return multus.CmdCheck(args, nil, nil)
+		},
+		func(args *skel.CmdArgs) error { return multus.CmdDel(args, nil, nil) },
+		cniversion.All, "meta-plugin that delegates to other CNI plugins")
+}