fixed the divisor value to match with the maximum number of transaction log count


git-svn-id: https://svn.apache.org/repos/asf/directory/apacheds/trunk@1632900 13f79535-47bb-0310-9956-ffa450edef68
o applying the same changes made to JdbmPartition as part of DIRSERVER-2002 to JdbmIndex
o changed the default cache level to 100, cause 2000 is also leading to OOM even when with 1GB heap size


git-svn-id: https://svn.apache.org/repos/asf/directory/apacheds/trunk@1632902 13f79535-47bb-0310-9956-ffa450edef68