[test] Drop no more used "maxeid" based deletion in BaseQuerierTC and derived tests This is probably only necessary for QuerierTC itself, move it there and drop incantation from other derived classes to deactivate this feature.

[rql2sql/test] Remove dead setUpModule tearDownModule they are overwritten a few lines below , hence this code is dead and not necessary for test success, drop it.

[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.