Set queryId in MetricsEmittingQueryRunner

- queryId is now user8 instead of user10, since it was already used
before
Merge pull request #430 from metamx/fix-null-query-id

Set queryId in MetricsEmittingQueryRunner
fix maven release plugin with recent versions of git
[maven-release-plugin] prepare release druid-0.6.70
[maven-release-plugin] prepare for next development iteration