[LTP] [RFC] Convert test catalog (docparse) from asciidoc to readthedocs.io (sphinx)

[Petr Vorel]

Hi

I suggest to convert test catalog ("docparse") generated by docparse/testinfo.pl
and asciidoc/asciidoctor to sphinx generator (readthedocs.io).
asciidoc/asciidoctor was a good choice at the time, but now it looks to me
better to use sphinx for everything.

I volunteer to do the work, but I would like to have a general agreement before
I do it.

Pros:

* We already have attempt to show tested syscalls [1]. Printing test catalog would
have more info.
* No need to install dependencies.
* Automatic. If we add also doc for stable releases, it would replace the need
to install dependencies and upload file to LTP release on GitHub [2]. Then only
link to page to test coverage on linux-test-project.readthedocs.io of particular
release (or link to whole doc on particular release) would be added in release
mail announcement (or we might keep adding generated pdf/epub/zipped html also
to LTP releases [2]).
* Unified look and feel.

Work needed:

* Convert docparse/testinfo.pl to doc/conf.py, obviously change from asciidoc
to spinx.
* Adding stable releases (not sure if it can be created automatically for all
tags).
* Adding offline formats [3] so that users can download the docs (that would be
useful anyway).

Kind regards,
Petr

[1] https://linux-test-project.readthedocs.io/en/latest/users/stats.html
[2] https://github.com/linux-test-project/ltp/releases
[3] https://docs.readthedocs.io/en/stable/downloadable-documentation.html