Move manpage gen to separate binary

This moves the man page generation to a separate binary

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

cmd/containerd/main.go

@@ -21,7 +21,6 @@ import (
 	"os"
 
 	"github.com/containerd/containerd/cmd/containerd/command"
-	"github.com/containerd/containerd/pkg/climan"
 	"github.com/containerd/containerd/pkg/seed"
 )
 
@@ -31,7 +30,6 @@ func init() {
 
 func main() {
 	app := command.App()
-	app.Commands = append(app.Commands, climan.Command)
 	if err := app.Run(os.Args); err != nil {
 		fmt.Fprintf(os.Stderr, "containerd: %s\n", err)
 		os.Exit(1)