This sets the file based backends (both the json and junit) to write out
an incomplete status before starting the test. (for junit this is a
'fail' with a message of 'incomplete', junit is a fairly limited
format). When the test is completed this incomplete status is
overwritten with the final status.

This patch also adds a new mode to the 'summary console' option, '-i',
which will list all tests with an incomplete status.

This will allow a developer to see what tests failed when a system
crashed, or what tests were running when they aborted piglit.

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