Additional rework of NSB report

Additional rework of NSB report

- Make format_for_jstree expect a list of metric names
- Avoid displaying timestamps twice in initial data table
- Sort metrics in initial data table
- Display testcase name
- Fix styling
- Make better use of JS and jQuery features
- Move event handler to JS file
- Avoid adding multiple tbody elements into data table
- Adjust unit tests and functional tests accordingly

JIRA: YARDSTICK-1367
Topic: report/html_table (12 of 12)

Change-Id: I85d853f8e392953cace67e94fa0af2e2492a2b86
Signed-off-by: Patrice Buriez <patrice.buriez@intel.com>