This patch adds UI templates directory and utils,
which serve and unify HTML generation.
Also, there are some fixes and improvements for HTML task report.
In this patch:
* Base mako templates (package rally.ui)
* Rework tests/ci/rally-gate templates
in order to use base template with generic header and styles
* Show scenario errors (if any) in task report tab
* Show scenario output (if any) in task report tab
* Show SLA data in Overview tab
* Show total scenario duration value (after the scenario name, above tabs)
* If got some iteration error, save exception class name in the database
instead of its repr()
* Prevent layout from breaking and show proper message if JS libs
can not be loaded for some reason
* Fix bug 1387661 - the cause of the bug is wrong input json data,
generated by plot.py. This happens when some atomic actions data
missed (which is a result of scenario errors) - and we have different
atomic actions sets between iterations. The fix saves atomic actions
integrity by adding missed atomic actions (with 0 value).
* Fix: if unexistend task uuid is specified in `task report' command,
then proper exception is raised
Closes-Bug: 1387661
Change-Id: I4bcbf86e6fad844e6752306eb6c1ccfefa6c6909