…ort 3.2.X branch

…shell can be in two different docker containers.

We need a deterministic listen-back port so the connecting (debugging) container can provide it at launch.
We need to write the payload file to a temporary location and it should have others read bit set so a container that dropped permissions can still read it.

There are a few settings required in the docker run command of the debugging container process, but not other requirements for the container under inspection.