[pkg] prepare 3.17.3

[pkg] Remove obsolete ubuntu hardy packaging It's been EOL for a while.

[book] fix sphinx documentation generation (closes #2991997) changeset 17994bf95d6a ([doc] update Session documentation) added cubicweb.server.session.Session autodoc to the book. This caused errors from sphinx due to a section title not being allowed in the class's docstring.

[test/ldap] fix ldap tests - make sure the url is properly updated on database setup (when the test database already exists and the ldap URI has changed) - fix the ldapuser test setup process.

[test] fix unittest_schemaserial.py A spurious add permission has been added in expected result by d988eec2d5d3

[test] make unittest_schemaserial.py runnable with python used to run fine only when launched using pytest

[facet] use facet name as input name for text widget (eg has_text) we need to ba able to distinguish between text-inputs so we can write a widget for a single facet that uses more than one text input. This fix consists in the diff in cubicweb.facts.js; modifications in facet.py result from this former.

[web doctype] don't give through reset_xmldecl to avoid double deprecation warning

[web doctype test] don't give reset_xmldecl to avoid deprecation warning

[devtool] randomise available ports search in http test This lowers the chance of parallel tests to race for the same port.