WIP do not commit: force to use rdiff-backup version 1.3.4nxd2-SlapOSPatched001 because the changes are not backward compatible

 * keep the start date
 * don't remove the file before writing in it (use > directly) so that the file always exist
 * format the date with ISO 8601
 * format all the lines the same way

This will let the monitor promise read this file easily

/reviewed-on !450

Always running SQL_CHANGE_MASTER breaks GTID setup (at least on 10.1.24)
as it resets MASTER_USE_GTID. So only run it when not using GTID.
Also, fold SQL_SET_GTID into the existing "if" bloc for simplicity.

Update jsonschema eggs and some dependent eggs (including setuptools - but it looks OK) so that we can validate draft7 of json schema.

Because jsonschema now bundles some schemas for json schemas, we don't need to include it here.

/reviewed-on nexedi/slapos!425

Also fix JSON schema, that was just invalid.

Now we have a schema that renders properly on
https://lab.nexedi.com/bk/rjs_json_form and is similar to the one from
erp5, so maybe one day we can have a convention on erp5 testnode to push
the URL of a selenium server as test-runner.server-url . In any case,
it's good for now to have consistency.

Most of this work comes from Boris Kocherov from https://www.raskon.org/
Thanks !

string.format must be a string according to
https://json-schema.org/understanding-json-schema/reference/string.html#format

We were using our own version of metaschema with a patch for this. Now
we are back to using official schema, but with a custom format
`internet-address` that should be equivalent to:

    "oneOf": [
      {
	"format": "hostname"
      },
      {
	"format": "ipv4"
      },
      {
	"format": "ipv6"
      }
    ],

The schema was not matching implementation (it was not even correct
schema)

Using
https://python-jsonschema.readthedocs.io/en/latest/validate/#versioned-validators
instead of a local copy of json schema

( not needed for the current work on jsonschema draft 7 support, but
done at the same time, to merge together two unrelated changes which
cause recompilation so that we recompile only once )

jsonschema = 3.0.0a3 needs a recent setuptools, probably because it uses
setuptools_scm

jsonschema needs six>=1.11.0

Version and requirements information containing six:
  [versions] constraint on six: 1.10.0
  Requirement of mock==2.0.0: six>=1.9
  Requirement of slapos.core==1.4.11: six
  Requirement of bcrypt==3.1.4: six>=1.4.1
  Requirement of cryptography==2.3.1: six>=1.4.1
  Requirement of jsonschema: six>=1.11.0
  Requirement of manuel: six
  Requirement of cliff: six>=1.9.0
  Requirement of pyOpenSSL>=18.0.0: six>=1.5.2

with support for draft7 of json schema

SlapOS instance for a self hosted version of http://www.plantuml.com/

README for this slapos software:

# PlantUML

http://plantuml.com/

PlantUML is a service rendering UML diagrams defined in a simple and intuitive
language.

Each diagram has a unique URL which is made of an encoded version of the
diagram code.

Diagrams can be rendered as png, svg or ascii art text.

See http://plantuml.com/PlantUML_Language_Reference_Guide.pdf for a full
reference on the diagram language.

/reviewed-on nexedi/slapos!435

Problem has been found, and as this mode emits a lot of data with test result
disable it.

  The support to debian 6 was dropped, so this compatibility layer is not needed anymore.

  On OBS the build system is quite particular and it has to work in a specific way,
  This file handles the difference between build from source and prepare things to OBS.

It will allow to track behaviour of the test on various test nodes.

Drop not needed references and logic for ssl_ca_crt old implementation.

  This version only display informations to change keyboard and set a NDB.

In "caddy-frontend: Improve generated files" ssl_ca_crt was mistakenly used
for client authentication, which is in reality not supported nor needed.

It came from misunderstanding of apache configuration.

custom_domain and server-alias on given slave do not have to clash, and
can be deduplicated during request parameter analysis.

/reviewed-on !444

Since caddy-frontend: Support wildcards the wildcards are supported.