Code review comment for ~locnnil/ubuntu/+source/ntpsec:fix-ntpsec-apparmor

To be clear, this is a fix for ntpsec, which will only become an issue if linuxptp's timemaster gets confined[1] and tries to use ntp as it's time backend.

I agree that this change could be applied upstream[2] to avoid a delta.

There is no urgency in getting this merged in time for Oracular.

1. https://code.launchpad.net/~locnnil/ubuntu/+source/linuxptp/+git/linuxptp/+merge/473653
2. https://salsa.debian.org/debian/ntpsec