This will be used later in this series

This status has a background color of purple in the html summary, and is
considered the worst status.

My logic for making it the worst status is as follows: basically we
always want this to show up as a regression, because it's a very unusual
status (only available when piglit is aborted or when the whole system
goes down).

v2: - use white text instead of black, it makes things infinitely more
      readable

Signed-off-by: Dylan Baker <dylanx.c.baker@intel.com>
Reviewed-by: Mark Janes <mark.a.janes@intel.com>