[maven-release-plugin] prepare for next development iteration
make leader election tougher
add more check
Merge pull request #381 from metamx/fix-leader

Make sure coordinator scheduling stops anytime there is a change in leadership
[maven-release-plugin] prepare release druid-0.6.52.2
[maven-release-plugin] prepare for next development iteration
curator 2.4.0 and Announcer logging lines are added regarding infos of reinstating
[maven-release-plugin] prepare release druid-0.6.52.3
druid-0.6.52.3