add a context to force 2 pass algorithm for topNs
Merge pull request #557 from metamx/context-force-2pass

Add a context to force 2 pass algorithm for topNs
[maven-release-plugin] prepare release druid-0.6.112
[maven-release-plugin] prepare for next development iteration
make sure the dynamic config has at least 1 thread
[maven-release-plugin] prepare release druid-0.6.113
[maven-release-plugin] prepare for next development iteration
fix coordinator dynamic configs
[maven-release-plugin] prepare release druid-0.6.114
[maven-release-plugin] prepare for next development iteration