Variety of python erorrs while building docs after adding integration/test submodule to docs repo

When building I get errors like:

> Importing test library '/Users/ckd/git-reps/docs/docs/submodules/integration/test/csit/libraries/riotdm.py' failed: ImportError: No module named requests

And many others like:
> sed: 1: "SxpLib.robot.html": invalid command code S
> sed: 1: "Tcpdump.robot.html": invalid command code T

Talking to Thanh in IRC, it sounds like these are currently expected with how the buildchain to produce robot docs interacts with being run from a VM that doesn't have the full CSIT suite installed, but are harmless.