DERBY-5133; nightly test failure in derbyall/storeall/storemore/SpaceTable
   converting the test to junit, with a retry for the selects that have shown instability


git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/trunk@1594231 13f79535-47bb-0310-9956-ffa450edef68