Fixed formatting in run-workload and report-benchmark-results

- Reduced the number of digits after the decimal point.
- In report-benchmark-results: If the reference results do not contain the same
  queries as the results, no comparison will be done.

Change-Id: I1e97009affdce2ac868a43bd19bf2dc13608bc37
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/3747
Reviewed-by: Lenni Kuff <lskuff@cloudera.com>
Tested-by: jenkins
IMPALA-1131: Measure time in sink::Close() in fragments' total time.

Change-Id: I811c6da0573f0ff58eea67455a78d0aecfd15d04
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/3742
Tested-by: jenkins
Reviewed-by: Nong Li <nong@cloudera.com>