DERBY-6045 (in list multi-probe by primary key not chosen on tables with >256 rows)

Adding a junit test but it will not run since the the fixture name is not starting with "test"... We should remove the x in front of test fixture's name once DERBY-6045 has been fixed



git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/trunk@1445030 13f79535-47bb-0310-9956-ffa450edef68