[rql2sql/test] Move base class from repotest to unittest_rql2sql
It's only used there, so move it closer to its usage.
Along the way, stop using lgc.testlib.
/*
* cubicweb js mock for unit tests
* This module defines variables and functions used in quite a few places
* in cw js framework that can't be used or guessed without a real CW server
*/
var pageid = 'my-page-id';
function _(message) {
return message;
}