DERBY-5630; intermittent test failure in store/lockTableVTI.sql
   merge of revision 1565761 from 10.9 converts this test to junit for more timing control


git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/branches/10.8@1566435 13f79535-47bb-0310-9956-ffa450edef68