doc: Write an index of environment variables used in testsuite

This was originally going to be just the testsuite but I kinda just
documented all of them.

I am tired of us not documenting these. This is a starting point to
producing an actually good index. I would like to enforce it in a
pre-commit hook eventually that we document all environment variables
used in Lix itself, even if it is terse dev facing docs.

This is full of a bunch of TODOs caused by auditing code. They should
probably be done at some point.

Change-Id: I7c0d3b257e19bae23d47d1efbd7361d203bccb0e

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