avoid npe on network bridge failure, dispose when not started on vm transport
https://issues.apache.org/jira/browse/AMQ-4485  - fix test regression with browse test - AMQ4595Test - reduce replay window when sync and asnyc cursor updates flip message order - concurrentStoreAndDispatch=true -  https://issues.apache.org/jira/browse/AMQ-5266 - increse default audit depth to match async jobs for concurrent store