Ship the rest of the docs

Continue to cherry-pick Python3 fixes for the tests from upstream

Run the tests at package build time

Adapt the tests into an AutoPkgTest

Figure out how to have tests that depends on a functioning Docker service work
at build time & AutoPkgTest time (needs root and we run the docker daemon
ourselves?)

Same as above but for singularity-container instead of docker.io

package python3-mesos


