Code review comment for ~paelzer/ubuntu/+source/chrony:lp-1898000-argparse-GROOVY

Thanks Bryce, now we have three options that work :-)

We only want to know if -x is set and nothing else - and we don't want to have to know what potential options there are - in the case above I don't want to care if one day there is a valid "-V 8" and update the getopt string.
To be clear, for full parsing your suggestion is great, but that isn't what I want/need here.

Therefore I'd prefer the small version I have proposed which achieves exactly that and nothing more but therefore also saves some complexities and hopefully will need no updates (that we might forget on merges) down the road.