From https://chromium.googlesource.com/infra/luci/luci-go:
git log a90d36d07f65098da34b600f6cfb8a5f05199ac5..63bd11762eec0b8604bc89dcfb9de4f5dad3777a --oneline vpython

e638db97 [vpython] Normalize spec before verification.
22c141ce [vpython] Remove maximum script path length check.
b1e7bc36 [vpython] Better failure output.
3edc75c8 [vpython] Better VirtualEnv isolation.

R=dnj@chromium.org, nodir@chromium.org

Bug:
Change-Id: I20d06c51760b27e70b9ce65c7ddd856943fab7eb
Reviewed-on: https://chromium-review.googlesource.com/731512Reviewed-by: Nodir Turakulov <nodir@chromium.org>
Reviewed-by: Ryan Tseng <hinoka@chromium.org>
Commit-Queue: Robbie Iannucci <iannucci@chromium.org>