cmd/docker-trust: Remove unused command registration

Both entry points use NewRootCmd, which adds subcommands directly.
Removed the unused registry registration and constructor.

Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>

cmd/docker-trust/trust/cmd.go

@@ -1,32 +0,0 @@
-package trust
-
-import (
-	"github.com/docker/cli/cli"
-	"github.com/docker/cli/cli/command"
-	"github.com/docker/cli/internal/commands"
-	"github.com/spf13/cobra"
-)
-
-func init() {
-	commands.Register(newTrustCommand)
-}
-
-// newTrustCommand returns a cobra command for `trust` subcommands.
-func newTrustCommand(dockerCLI command.Cli) *cobra.Command {
-	cmd := &cobra.Command{
-		Use:   "trust",
-		Short: "Manage trust on Docker images",
-		Args:  cli.NoArgs,
-		RunE:  command.ShowHelp(dockerCLI.Err()),
-
-		DisableFlagsInUseLine: true,
-	}
-	cmd.AddCommand(
-		newRevokeCommand(dockerCLI),
-		newSignCommand(dockerCLI),
-		newTrustKeyCommand(dockerCLI),
-		newTrustSignerCommand(dockerCLI),
-		newInspectCommand(dockerCLI),
-	)
-	return cmd
-}