update java-util
Merge pull request #525 from metamx/update-java-util

update java-util
Fix race

Fix race in ingestion that can cause FNF,
Properly check for partitionNum
shutdown persistExecutor
hasSwapped properly check

protect check for hasSwapped.
Merge pull request #526 from metamx/fix-race-ingestion

Fix FileNotFound in realtime nodes
update docs version
[maven-release-plugin] prepare release druid-0.6.104
[maven-release-plugin] prepare for next development iteration