Small modification to assist in debugging.

git-svn-id: https://svn.apache.org/repos/asf/activemq/activemq-apollo/trunk@1459005 13f79535-47bb-0310-9956-ffa450edef68
Fixes APLO-313: Avoid blocking producers if consumers are not likely to catch up within a few seconds.

git-svn-id: https://svn.apache.org/repos/asf/activemq/activemq-apollo/trunk@1459006 13f79535-47bb-0310-9956-ffa450edef68
APLO-314: If the leveldb paranoid_checks option is enabled, verify the integrity of index when it's copied/checkpointed

git-svn-id: https://svn.apache.org/repos/asf/activemq/activemq-apollo/trunk@1459007 13f79535-47bb-0310-9956-ffa450edef68