- Use latest slapos.toolbox (0.41.0)
- stack/erp5/buildout.cfg add script is-local-tcp-port-opened
- Change instance-mariadb promise to use is-local-tcp-port-opened

The monitor runs promises every 5 minutes.
The previous mariadb promise check for listening tcp port by openning
a socket and closing it, causing mariadb to block the host after a
defined amount of time.

The new script `is-local-tcp-port-opened` checks for opened tcp port
on current machine by reading /proc/net/tcp{,6}. No socket is opened.
Maria should not block hosts anymore.

This reverts commit 5d64a458.

Conflicts:
	stack/erp5/buildout.cfg
	stack/erp5/instance-erp5-cluster.cfg.in
	stack/erp5/instance-erp5-single.cfg.in
	stack/monitor/buildout.cfg

Conflicts:
	stack/erp5/buildout.cfg
	stack/erp5/instance-zope.cfg.in
	stack/erp5/instance.cfg.in
	stack/monitor/buildout.cfg

also add a temporary patch to respect more tokens in natural language mode.

Move dcron test in dedicated directory/file.
Also move slapos/recipe/test to slapos/test.
Currently : only dcron test.

Conflicts:
	software/slaprunner/schema.json
	software/slaprunner/software.cfg.json

also use the explicit version of nginx-dav-ext-module.
also remove too old nginx-unstable.

stop using quite old setuptools in slapos itself, because many eggs already drop python 2.4/2.5 support.