- Add pygolang/buildout-dev.cfg that overrides [pygolang] to use the
  software from git checkout.

- Add pygolang/test.cfg that is software-release to create a test
  instance to be run under testnode. This software release uses
  just-added stack/nxdtest.cfg to help itself on this task, so the code
  in pygolang is minimal.

A new section [python-interpreter] is added, because python interpreters
that zc.recipe.egg generates don't process `-m args` correctly and
handle subprocess well. I had to workaround that with code from
gpython.pymain to be able to run `python -m pytest --<pytestarg>` and to
spawn children processes with preserving sys.path. Comments around and
inside [python-interpreter] has more details on this topic.

Pytest is used to test wendelin.core, zodbtools and pygolang
It is also used in component/unstable/pyodide, but currently via pip.

Currently Nexedi takes mostly a copy-paste approach when it comes to
organizing bin/runTestSuite and an instance to run this inside testnode:

    kirr@deco:~/src/wendelin/slapos/slapos-master$ git ls-files |grep runTestSuite
    software/build-rina/runTestSuite.in
    software/buildout-testing/runTestSuite.in
    software/cython-test/runTestSuite.in
    software/erp5testnode/testsuite/deploy-test/runTestSuite.py
    software/jstestnode/runTestSuite.in
    software/neoppod/runTestSuite.in
    software/neoppod/stress-testing/runTestSuite.in
    software/unstable/pyodide/runTestSuite.in

and adding new tests to be run this way will only increase the entropy.

Let's stop this, at least for new tests, and use a uniform approach without copying:

1) I've created nxdtest tool[1] which allows a project to specify in
   declarative way how to test itself: given such declaration nxdtest
   takes on itself the responsibility to communicate with testnode
   master, to drive test commands spawning etc, and leaves to the
   project only semantic part that is specific to the particular
   project.

   Nxdtest is based on my go/neo/t/nxd/runTestSuite[2,3] and on the code
   I've seen elsewhere scattered in other runTestSuite.in files.

2) Let's add stack/nxdtest.cfg to SlapOS that provides easy way for a
   software or component to organize testing of itself.

This patch adds stack/nxdtest and migrates software/neotest to use it
(because stack/nxdtest is based on it and this way it helps to track the
changes).

In the following patches we will add testing support for pygolang,
zodbtools and wendelin.core .

[1] https://lab.nexedi.com/kirr/nxdtest/blob/master/nxdtest
[2] kirr/neo@51b18490
[3] kirr/neo@f67c147d

${go:exe} is standalone executable that runs go in activated gowork environment.
It is handy to use in recipes where one cannot source ${gowork:env} -
in particular parts with recipe=zc.recipe.egg

Wendelin.core 2 will use `GO=${go:exe}` in its build environment.

GDB is used in wendelin.core tests:
https://lab.nexedi.com/nexedi/wendelin.core/blob/v0.13-49-g35cb144/t/tfault-run#L28

Starting from 0.14 (aka 2) wendelin.core requires pygolang to be present
both at runtime and at build time.

Update lab.nexedi.com/kirr/neo.git and lab.nexedi.com/kirr/go123 to latest.
Update all other go packages.

The update puls in the following new dependencies:

    github.com/shamaton/msgpack
    github.com/tinylib/msgp
      github.com/philhofer/fwd
      github.com/ttacon/chalk
      golang.org/x/mod
      golang.org/x/xerrors

    github.com/davecgh/go-spew
    github.com/pmezard/go-difflib
    gopkg.in/yaml.v3

Going from 0.0.0.dev4 to -> 0.0.0.dev8 zodbtools:

- Stabilized `zodb dump` format and layed ground for `zodb restore`;
- Taught `zodb analyze` to work with any ZODB storage (instead of being
  FileStorage-only tool) and to analyze a particular range of history
  (instead of crunching data for days on a large database);
- Added `zodb commit` tool that is handy in testing;
- Added ability to specify tid ranges in human-readable format, as in
  e.g. `zodb analyze data.fs 2018-01-01T10:30:00Z..yesterday`.
- Progressed on Python3 support.

See https://pypi.org/project/zodbtools/#zodbtools-change-history
for details.

Close to non-functional change, but removes PendingDeprecationWarning
about cgi.parse_qsl

0.0.0.dev4 to 0.0.7.post1 goes a long way. See
https://pypi.org/project/pygolang/#pygolang-change-history for details.

Recent pygolang is needed for wendelin.core 2.
Zodbtools also uses it starting from v0.0.0.dev5.

We already patch ZEO4 with TCP_NODELAY patch (see 5cf4cf1f "ERP5:
enable TCP_NODELAY for ZEO") and we will need to backport more patches
to ZEO4 branch for wendelin.core 2 to work correctly.

It's not only software/neoppod which uses ZEO, and it is not convenient for
all other software-releases to inherit from neoppod to use correct
version and build of ZEO egg. For this reason factor out details of ZEO
egg building into component/ZEO and let users use ${ZEO:egg} where ZEO
is needed. This way ZEO will be correctly installed for all users.

This patch should be a non-functional change. We switch to
nexedi/ZEO@5114f909 revision which corresponds to ZEO 4.3.1 +
TCP_NODELAY.patch

Adding other patches to ZEO4 needed by wendelin.core 2 will be done as a
separate step.

See merge request nexedi/slapos!836

stop-on-error during instantiation can lead to endless instantiation in some
cases, which disallows to create services required for given part to pass, and
in the same time in many cases the called scripts are smart enough to continue
and restart on error.

Thanks to this, it's much easier to find relevant configuration, and also logs
are becoming much more informative.

Avoid creating needless entries and minimise needless newlines, and reflect
this in test data, as in such case no backend_log is created, as nothing is
configured on backend Haproxy level.

SSL cache is unusable in context of caddy, same for the so called HTTPD home.
Those are old Apache leftovers.

It's a dict, and in SlapOS usage of Jinja2 it's good to see the type of
a variable immediately.

"parameter_dict" says nothing, whereas "software_parameter_dict" explains
source and purpose of the information.

There is needless duplication of information.

That's true, that those are templates, but the important information which
shall be in the name of the parameter is its purpose - a profile.

Section template-apache-frontend was not updated in buildout.hash.cfg

development.cfg is never used, and having split software definition in
software.cfg and common.cfg just makes development harder.

See merge request nexedi/slapos!832