CFT: Read test output stream scanner line by line to deal with long outputs.

BUG=b:398992364
TEST=CQ

Change-Id: I78935fe06cac90eab0a837ba88d3273fc53b15e9
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/6309836
Commit-Queue: Alex Bergman <abergman@google.com>
Tested-by: Alex Bergman <abergman@google.com>
Reviewed-by: Allen Xie <zhihuixie@google.com>
1 file changed