[tests] Move 'anonymous_allowed' property from CubicWebServerTC to CubicWebTC
The effective set of the property on the config is now done later that before,
ie at the end of CubicWebTC.init_config instead of before.
It is believed not to have an impact on the test suites that uses
`anonymous_allowed`.
Related to #4002134
\.svn
^build$
^dist$
\.pyc$
\.pyo$
\.bak$
\.old$
\~$
\#.*?\#$
\.swp$
^doc/book/en/apidoc$
\.old$
syntax: regexp
.*/data/database/.*\.sqlite
.*/data/database/.*\.config
.*/data/database/tmpdb.*
.*/data/ldapdb/.*
^doc/html/
^doc/doctrees/
^doc/book/en/devweb/js_api/
data/pgdb/