code: func (h *Handle) ClassReplace(class Class) error {
  	return h.classModify(unix.RTM_NEWTCLASS, unix.NLM_F_CREATE, class)
  }
docs: // ClassReplace will replace a class to the system.
  // quivalent to: `tc class replace $class`
  // The handle MAY be changed.
  // If a class already exist with this parent/handle pair, the class is changed.
  // If a class does not already exist with this parent/handle, a new class is created.