[autotest] Experimental tests do not influence the exit code of test_that

Use --ignore_experimental_tests option when calling generate_test_report
script.

CQ-DEPEND=CL:Idd7b0fafc9ffe081504b4cf8c1e3e771878ee06e
TEST=Confirmed that when only experimental tests failed, test_that
exits with code 0.
BUG=chromium:265989

Change-Id: I30e6a18be6cdda04b2e38c14ddfcb394c5bf6d56
Reviewed-on: https://chromium-review.googlesource.com/171731
Reviewed-by: Aviv Keshet <akeshet@chromium.org>
Tested-by: Fang Deng <fdeng@chromium.org>
Commit-Queue: Fang Deng <fdeng@chromium.org>
1 file changed