discovery: handle deletion of 'wireproto' module
Mercurial commit b4d85bc122bd. deleted the wireproto module and its
contents are now in various other modules, so we can not even do
unchecked imports of it now.
=============================Training supports=============================Contributing============The main source for the supports is the `slides.md` but it doesn't containsall the source.The `slides.md` file contains several snippets that are replaced by otherfiles at compilation time.For example:..code::markdown ~~~raw-file output/fix-a-bug-base.log ~~~Will replace this three lines by the content of the file `output/fix-a-bug-base.log` which is generated when running the .t test file (see below forinstruction how to do that)...code::markdown ~~~graphviz-file graphs/fix-bug-1.dot ~~~Will replace this three lines by the svg rendering of the graphviz definitionin the file `graphs/fix-bug-1.dot`. This file is generated when running the .ttest file (see below for instruction how to do that).Environment preparation=======================This training supports needs pandoc to compile.You'll need a copy of the Mercurial source in order to generate the trainingsupports.You will also needs a functioning Python environment with the possibility touse `pip install` with your current user. In doubt, you can use a `virtualenv<https://virtualenv.pypa.io/en/stable/>`.You can then run the `prepare.sh` script that will configure the environmentfor you.Generating the supports=======================First, you need to run a .t test file to generate a bunch of files. You canrun the test file with this command:`python /PATH/TO/MERCURIAL/tests/run-tests.py -l test-training.t`It should have generated files in at least two directories: `graphs` and`output`.Finally, launch the `compile.sh` to generate the `index.html` output file.