exo: FIX cobra error issue spf13/cobra#340 temporarily

Signed-off-by: Pierre-Emmanuel Jacquier <[email protected]>

cmd/root.go

@@ -51,16 +51,16 @@ type config struct {
 
 // RootCmd represents the base command when called without any subcommands
 var RootCmd = &cobra.Command{
-	Use:   "exo",
-	Short: "A simple CLI to use CloudStack using egoscale lib",
+	Use:          "exo",
+	Short:        "A simple CLI to use CloudStack using egoscale lib",
+	SilenceUsage: true,
 	//Long:  `A simple CLI to use CloudStack using egoscale lib`,
 }
 
 // Execute adds all child commands to the root command and sets flags appropriately.
 // This is called by main.main(). It only needs to happen once to the RootCmd.
 func Execute() {
 	if err := RootCmd.Execute(); err != nil {
-		fmt.Println(err)
 		os.Exit(1)
 	}
 }