Merge pull request #1061 from tushargosavi/hds

Improve tests for HDSQueryOperator.
Some cleanup.
Log result count.
Ignore queries for other buckets.
Query results retained on keepalive.
Merge pull request #1065 from tweise/hds

Hds
Remove default large application window size for DimensionsComputation
operator. Let user specify the application window through dt-site.