cmd: move cli files to cmd package

Signed-off-by: Stephen J Day <stephen.day@docker.com>

cmd/ctr/main.go

@@ -0,0 +1,49 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/Sirupsen/logrus"
+	"github.com/docker/containerd"
+	"github.com/urfave/cli"
+)
+
+func main() {
+	app := cli.NewApp()
+	app.Name = "ctr"
+	app.Version = containerd.Version
+	app.Usage = `
+        __      
+  _____/ /______
+ / ___/ __/ ___/
+/ /__/ /_/ /    
+\___/\__/_/     
+                
+containerd client
+`
+	app.Flags = []cli.Flag{
+		cli.BoolFlag{
+			Name:  "debug",
+			Usage: "enable debug output in logs",
+		},
+		cli.StringFlag{
+			Name:  "socket, s",
+			Usage: "socket path for containerd's GRPC server",
+			Value: "/run/containerd/containerd.sock",
+		},
+	}
+	app.Commands = []cli.Command{
+		runCommand,
+	}
+	app.Before = func(context *cli.Context) error {
+		if context.GlobalBool("debug") {
+			logrus.SetLevel(logrus.DebugLevel)
+		}
+		return nil
+	}
+	if err := app.Run(os.Args); err != nil {
+		fmt.Fprintf(os.Stderr, "containerd: %s\n", err)
+		os.Exit(1)
+	}
+}