command: Remove the useless "debug" subcommand

This is just a husk of a container command that has no nested commands
under it, so it isn't serving any purpose.

command/debug_command.go

@@ -1,30 +0,0 @@
-package command
-
-import (
-	"strings"
-
-	"github.com/mitchellh/cli"
-)
-
-// DebugCommand is a Command implementation that just shows help for
-// the subcommands nested below it.
-type DebugCommand struct {
-	Meta
-}
-
-func (c *DebugCommand) Run(args []string) int {
-	return cli.RunResultHelp
-}
-
-func (c *DebugCommand) Help() string {
-	helpText := `
-Usage: terraform debug <subcommand> [options] [args]
-
-  This command has subcommands for debug output management
-`
-	return strings.TrimSpace(helpText)
-}
-
-func (c *DebugCommand) Synopsis() string {
-	return "Debug output management (experimental)"
-}

commands.go

@@ -95,7 +95,6 @@ func initCommands(
 
 	PlumbingCommands = map[string]struct{}{
 		"state":        struct{}{}, // includes all subcommands
-		"debug":        struct{}{}, // includes all subcommands
 		"force-unlock": struct{}{},
 		"push":         struct{}{},
 		"0.12upgrade":  struct{}{},
@@ -339,12 +338,6 @@ func initCommands(
 			}, nil
 		},
 
-		"debug": func() (cli.Command, error) {
-			return &command.DebugCommand{
-				Meta: meta,
-			}, nil
-		},
-
 		"force-unlock": func() (cli.Command, error) {
 			return &command.UnlockCommand{
 				Meta: meta,