It's possible that remote closes connection, which would result in a
stacktrace being shown in the stderr. Silence this exception, as we do
with other exceptions.

R=gavinmak@google.com

Bug: 1328518
Change-Id: Ifae2aca64fe5d572c0b71008f6dacbb63ba77e06
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3664178Reviewed-by: Gavin Mak <gavinmak@google.com>
Auto-Submit: Josip Sokcevic <sokcevic@google.com>
Commit-Queue: Gavin Mak <gavinmak@google.com>