goofy: correctly receive new return value of BuildAllTestLists

BuildAllTestLists now returns a tuple, test_lists and failed_files.
goofy/invocation.py and tools/factory.py didn't reflect the change.
This CL fix this bug.

TEST=make test, manual test
BUG=None

Change-Id: I20ec89b99c1c96d0c68ab48121a4b2e83c2ab49c
Reviewed-on: https://chromium-review.googlesource.com/329440
Commit-Ready: Wei-Han Chen <stimim@chromium.org>
Tested-by: Wei-Han Chen <stimim@chromium.org>
Reviewed-by: Joel Kitching <kitching@chromium.org>
2 files changed