Any use of erp5_sql_transactionless_connection must end with an explicit SQL
commit, otherwise it does nothing and it may even leave SQL locks.

Contrary to InnoDB, TokuDB locks on such statement. test_InvoiceViewAsODT
is the only test that does not use erp5_sql_transactionless_connection
(other tests do via IdTool), breaking the next test
(test_PackingListEditAndInvoiceRule) with "Lock wait timeout exceeded" error.

One would except that the tests use the same instance of
erp5_sql_transactionless_connection, and in this case it would not fail, but
for bad reasons, tests alternate between 2 different ZODB Connection instances.