message: iostas: clean dead code up - toggle_files_accounting
  This function is not used anymore. Clean it up.
diff: @@ -464,17 +464,6 @@ pub fn export_files_access_pattern(name: &Option<String>) -> Result<String, IoSt
  }
  }
  -pub fn toggle_files_recording(name: &Option<String>, switch: bool) -> Result<(), String> {
  - if let Some(name) = name {
  - let ios_set = IOS_SET.read().unwrap();
  - let v = ios_set.get(name).ok_or_else(|| "No such id".to_string())?;
  - v.toggle_files_recording(switch);
  - Ok(())
  - } else {
  - Err("Invalid id passed!".to_string())
  - }
  -}
  -
  pub fn export_global_stats(name: &Option<String>) -> Result<String, IoStatsError> {
  // With only one rafs instance, we allow caller to ask for an unknown ios name.
  let ios_set = IOS_SET.read().unwrap();
  