[ldapfeed] make code compatible with ldap3>=2 * Some constants have been renamed. * Directly bind when data-cnx-dn/data-cnx-password are provided, some servers, including ours require this. * Use raise_exceptions=True to avoid ignored ldap errors * raise in case of failed anonymous bind * do not search for "dn" attribute because this raise an "invalid attribute" with new ldap3 versions * Password is now returned as bytes, so no longer need to encode them before crypt. * modification_date is now returned as a datetime object Co-Authored-By: Philippe Pepiot <philippe.pepiot@logilab.fr> Closes #16073071

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### Requirements for tests in various cubicweb/**/test directories. ###

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## shared by several test folders

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docutils

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webtest

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## cubicweb/test

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Pygments

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pycryptodomex

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#fyzz XXX pip install fails

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## cubicweb/devtools/test

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flake8

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## cubicweb/hooks/test

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psycopg2-binary

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## cubicweb/pyramid/test

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pyramid >= 1.5.0

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waitress >= 0.8.9

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wsgicors >= 0.3

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pyramid_multiauth

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repoze.lru

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## cubicweb/sobject/test