etcdctl: Rename Start / StartWithErrors to MustStart

etcdctl/ctlv3/ctl.go

@@ -95,15 +95,15 @@ func init() {
 	)
 }
 
-func StartWithError() error {
+func Start() error {
 	rootCmd.SetUsageFunc(usageFunc)
 	// Make help just show the usage
 	rootCmd.SetHelpTemplate(`{{.UsageString}}`)
 	return rootCmd.Execute()
 }
 
-func Start() {
-	if err := StartWithError(); err != nil {
+func MustStart() {
+	if err := Start(); err != nil {
 		command.ExitWithError(command.ExitError, err)
 	}
 }