This reverts commit 37a0e975.

It was too early to change this default value, code requesting test
instance is not ready for this yet, which in turn prevents latest SR
improvements from being tested. Break the cycle by creating test databases
again. This code will go away again in the future.

Move haproxy httpchk configuration per-listen as zope's webdav returns 401
on (at least) GET / . TCP-level checks are still active, which should be
sufficient.
Also, change zope_family_address_list check to getitem as it's more natural
than concatenating.
Also, stop using apache.zope.backend recipe to add support for per-port
scheme so automatic ERP5Site creation knows which URL is really HTTP.
Also, stop using certificate_authority recipe and call openssl directly
when generating self-signed cert for https/webdavs support.
Also, rework balancer parameters a bit (still undocumented).
Also, make instance-balancer always publish ipv6 value (empty when no ipv6
available), so instance-erp5 always succeeds.

Dot not move longrequest-logger parameters out yet, as they belong to
another section.

Check got removed from code, comment lingers on.

Escaping is right, but "raw" context entry type does not de-serialise, so
deadlock debugger password was stored in an unintended format. Moving
deadlock_debugger_password to a buildout section involves required magic.
Move other parameters for consistency.
Also, honour deadlock_path parameter, which was previously ignored.

Do not expose a parameter, as index can be reconstructed from data anyway.
Rotating is anyway needed as index backup can take a significant amount of
space for rare practical use.
Also, remove this point from TODO.

I reviewed parameters (both in code and in documentation) and think they are
now consistent and sane enough to not block a merge.

Balancer parameters were and are not supported, so this compatibility
breakage is not important.
The goal of this change is to make balancer parameter layout consistent
with other software-types.
Also, balancer's base TCP port is not taken from empty-string parameter
anymore.

inkscape seems not to start with glib 2.39 or later like :
futex(0x7fff41df100c, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 1, NULL, 7ffedf9a4a00) = -1 EAGAIN (Resource temporarily unavailable)

They contain section references, not immediate values, so they are intended
to be evaluated by buildout and hence must not be escaped.