Make generate_test_report.py tolerate WARN status

Instead of a WARN being considered as a hard failure, make
generate_test_report.py treat it as a pass, but still gather up
the reason for the warning and print it in the report.

BUG=chromium-os:39147
TEST=run generate_test_report.py on test results containing a WARN (like those from dummy_Fail)

Change-Id: I51a0c4a54d0327e3e821589927d0e9fa2bfd9ebc
Reviewed-on: https://gerrit.chromium.org/gerrit/44248
Reviewed-by: Chris Masone <cmasone@chromium.org>
Tested-by: Chris Masone <cmasone@chromium.org>
Commit-Queue: Chris Masone <cmasone@chromium.org>
1 file changed