Move update-passphrase command to "credential" parent command

This deprecates "secrethub config update-passphrase" command, in
favor of "secrethub credential update-passphrase".

Author: SimonBarendse

internals/secrethub/config.go

@@ -21,7 +21,7 @@ func NewConfigCommand(io ui.IO, store CredentialConfig) *ConfigCommand {
 
 // Register registers the command and its sub-commands on the provided Registerer.
 func (cmd *ConfigCommand) Register(r command.Registerer) {
-	clause := r.Command("config", "Manage your local configuration.")
+	clause := r.Command("config", "Manage your local configuration.").Hidden()
 	NewConfigUpdatePassphraseCommand(cmd.io, cmd.credentialStore).Register(clause)
 	NewConfigUpgradeCommand().Register(clause)
 }

internals/secrethub/credential.go

@@ -27,4 +27,5 @@ func (cmd *CredentialCommand) Register(r command.Registerer) {
 	NewCredentialListCommand(cmd.io, cmd.clientFactory.NewClient).Register(clause)
 	NewCredentialBackupCommand(cmd.io, cmd.clientFactory.NewClient).Register(clause)
 	NewCredentialDisableCommand(cmd.io, cmd.clientFactory.NewClient).Register(clause)
+	NewConfigUpdatePassphraseCommand(cmd.io, cmd.credentialStore).Register(clause)
 }