Add configurations for omitting package testing

[cottsay]

The goal here is to provide a mechanism to disable test invocation in the binary package builds (deb/RPM) but maintain the existing best-effort behavior.

[gavanderhoorn]

Is this work towards a fix for #895?

[cottsay]

Is this work towards a fix for #895?

No, this would allow us to disable testing in debian and RPM package builds entirely.

[nuclearsandwich]

I raised a couple of questions but nothing that I think is really blocking. The configuration file layout is something we discussed offline and I think it's the best way to evolve how we're handling testing during package builds.