Improvements for HTML output of rally verify results

Changes:
  * Move rally/verification/verifiers/tempest/report_templates/main.mako
    to rally/ui/templates/verification/report.mako
  * Reimplement rally/ui/templates/verification/report.mako
    for cross-project layout and styling, refactor JS code
  * Refactoring in rally.verification.verifiers.tempest.json2html
  * Remove unnecessary `setUpClass' from skipped tests names

Change-Id: Ib403dd8bb49ec0c98f812171e737a01414229979