[client] six.ensure_str() in to_str() in subprocess42
[client] six.ensure_str() in to_str() in subprocess42

Bug: 1104068
Change-Id: Ie12747127756dd5ad3f16c8afec4151d097cd00c
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-py/+/2291476
Reviewed-by: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org>
Commit-Queue: Junji Watanabe <aaef61ef98ffea505db831f310be2a0eb8492537@google.com>

luci/luci-py,luci/luci-py,luci/luci-py,luci/luci-py