protected boolean checkReloaded() {
        Long reloaded = reloadedGeneration.getAndSet(null);
        if (reloaded != null) {
            setGeneration(reloaded);
            return true;
        }
        return false;
    }
True if someone has set the {@link #reloadedGeneration} number by calling {@link #reload(long)}
and hence wants to force a given generation programmatically. If that is the case,
sets the generation and flags it as changed accordingly.

@return true if {@link #reload(long)} has been called, false otherwise
config/src/main/java/com/yahoo/config/subscription/impl/ConfigSubscription.java