'running' image tests should not be shown in the same color as failed ones

[Steve Langasek]

Currently, images whose tests are still running are shown on http://ci.ubuntu.com/smokeng/utopic/touch/ using the same color scheme as for finished tests, based on the overall percentage of pass/fail tests. This is misleading, because the pass/fail percentage can only be directly compared once all of the tests have been run. In-progress tests should be shown in a different color - possibly grey? - to not mislead.