vinn: Speculative fix for windows.
vinn: Speculative fix for windows.

It is possible that vinn is unable to remove some files because the d8
process hasn't completely shut down by the time popen.communicate()
returns. So try a few times (=3), with a one-second delay between each
retry.

BUG=chromium:946012

Change-Id: Id7679d8ab3963c5789aaf93c5c9d57efe6b67ab6
Reviewed-on: https://chromium-review.googlesource.com/c/catapult/+/1541443
Commit-Queue: Sadrul Chowdhury <be235e35a6c144329e4aa1b0fbe2c3f8c71f3676@chromium.org>
Reviewed-by: Caleb Rouleau <58bdb6276c01e3ed53e660bf706aa902204feb0d@chromium.org>

catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult