with support for aborting query ( https://github.com/mroonga/mroonga/issues/344 )

Configuring failover URL and being able to rely on cached content is not so
simple, thus document the requirement and prove in test, that such
configuration works correctly.

Checking SLAPOS_TEST_DEBUG in the test itself came from ancient history of the
testcase, it's time to drop it and use modern apporach.

This includes xmlsec, the C library and its python bindings in ERP5, using the latest versions that are compatible with python 2.

`1.3.9` is the latest version of the python bindings with python 2 support and `1.2.30` is the latest version of the C library compiling with this version of the python bindings.

See merge request nexedi/slapos!1272

Since slapos.core!436 requesting with `--parameters-file` requires
that a JSON schema exists at <sr-url>.json for the requested SR.

Missing trailing /

See nexedi/slapos@5e1ff2de

zlib source url has been moved. Please see issue
https://github.com/madler/zlib/issues/649 for reference.

See merge request !1276

Co-authored-by: Kazuhiko SHIOZAKI <kazuhiko@nexedi.com>

Running test as last makes no sense nowadays, as the site is fully prepared.
Awaiting for each possible log of configured frontend is not worth the
requirement, so make those tests as first ones, which simplifies running only
them with reproducible effect.

All tests which could be affected by that fact has been identified and changed.

otherwise it probably uses system's openssl.

Setting rpath seems not needed because we are using
-DBUILD_SHARED_LIBS=OFF here.

https://github.com/sigoden/dufs

New software to serve static files

See merge request !1270

caddy-frontend-N is bad name, it's just frontend-node-N.