Remove removed upgrade commands

Delete commands that are no longer in Terraform and have been
removed for a full release cycle.

Author: pselle

command/012_config_upgrade.go

@@ -328,18 +328,6 @@ func initCommands(
 		// Plumbing
 		//-----------------------------------------------------------
 
-		"0.12upgrade": func() (cli.Command, error) {
-			return &command.ZeroTwelveUpgradeCommand{
-				Meta: meta,
-			}, nil
-		},
-
-		"0.13upgrade": func() (cli.Command, error) {
-			return &command.ZeroThirteenUpgradeCommand{
-				Meta: meta,
-			}, nil
-		},
-
 		"force-unlock": func() (cli.Command, error) {
 			return &command.UnlockCommand{
 				Meta: meta,
@@ -408,8 +396,6 @@ func initCommands(
 	}
 
 	HiddenCommands = map[string]struct{}{
-		"0.12upgrade":     struct{}{},
-		"0.13upgrade":     struct{}{},
 		"env":             struct{}{},
 		"internal-plugin": struct{}{},
 		"push":            struct{}{},