update_depot_tools has become chatty since https://crrev.com/c/3556588,
which interfers with processing output from commands being recursed.

Change-Id: I47ea49fbe2b1c196562ef8389d981abe8eb5788b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3561658
Commit-Queue: Andrey Kosyakov <caseq@chromium.org>
Auto-Submit: Andrey Kosyakov <caseq@chromium.org>
Reviewed-by: Josip Sokcevic <sokcevic@google.com>
Commit-Queue: Josip Sokcevic <sokcevic@google.com>