Classic confinement for dataplicity-agent

I’m sorry for the the time it took to verify this in more detail. Reading through the documentation of the project, the use cases reported matches with a class of problems that we’ve been avoiding classic confinement, at least for the time being: open-ended access into the whole device by remote parties, for management purposes.

Our suggestion for these problems right now is to continue packaging them as deb packages, and offering them through a PPA or other form of custom repository.