testing: roll back CL 44352 (show in-progress tests upon SIGINT)
CL 44352 changed the behavior of SIGINT, which can break tests that
themselves use SIGINT. I think we can only implement this if the
testing package has a way to know whether the code under test is using
SIGINT, but os/signal does not provide an API for that. Roll back for
1.9 and think about this again for 1.10.
Updates #19397
Change-Id: I021c314db2b9d0a80d0088b120a6ade685459990
Reviewed-on: https://go-review.googlesource.com/48370
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>