software/jstestnode: move selenium configuration in test-runner key
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 !
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