Disable usage output on errors

This causes command help messages to appear everytime an error is triggered.

pkg/cmd/dcos.go

@@ -19,7 +19,8 @@ const annotationUsageOptions string = "usage_options"
 func NewDCOSCommand(ctx api.Context) *cobra.Command {
 	var verbose int
 	cmd := &cobra.Command{
-		Use: "dcos",
+		Use:          "dcos",
+		SilenceUsage: true,
 		PersistentPreRun: func(cmd *cobra.Command, args []string) {
 			if verbose == 1 {
 				// -v sets the logger level to info.
@@ -91,7 +92,6 @@ func pluginCommand(executable string, pluginManager *plugin.Manager, c *plugin.C
 		Short:              c.Description,
 		DisableFlagParsing: true,
 		SilenceErrors:      true, // Silences error message if command returns an exit code.
-		SilenceUsage:       true, // Silences usage information from the wrapper CLI on error.
 		RunE: func(cmd *cobra.Command, args []string) error {
 			// Prepend the arguments with the commands name so that the
 			// executed command knows which subcommand to execute (e.g.