kunit.py: handle timeout

Make kunit_kernel.py terminate process and append timeout status to log
on timeout.
Make kunit_parser.py handle timeout case when parsing and displaying
output.

Signed-off-by: Avi Kondareddy <avikr@google.com>
Google-Bug-Id: 116318265
Change-Id: Ieb4190586e69c70b3c754d21e40f7e80593323d5
4 files changed