DERBY-6775 add to testBlobLinkedListReclamationOnRollback() test to check that free space is used on subsequent inserts

fix retry counter, it was being reset every time through loop.



git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/trunk@1645081 13f79535-47bb-0310-9956-ffa450edef68