[vpython] Bump vpython version

This fixes the bug where virtualenvs bootstrapped from vpython virtualenvs
would fail to build.

R=nodir@chromium.org, tandrii@chromium.org, vadimsh@chromium.org

Bug: 784597,800599
Change-Id: Iddcda5fca5f395f031df7a200c688d55ab74ae95
Reviewed-on: https://chromium-review.googlesource.com/860959
Reviewed-by: Vadim Shtayura <vadimsh@chromium.org>
Commit-Queue: Robbie Iannucci <iannucci@chromium.org>

cipd_manifest.txt

@@ -8,7 +8,7 @@ $VerifiedPlatform mac-amd64
 $VerifiedPlatform windows-386 windows-amd64
 
 # vpython.
-infra/tools/luci/vpython/${platform}  git_revision:000e38c9086590a3b76c3add3af8c25d047505dd
+infra/tools/luci/vpython/${platform}  git_revision:9d158814f77dc305eeb5d440df88c80e26e2b13b
 
 # LUCI editor
 infra/tools/luci/led/${platform}  git_revision:54b6b3102fbb15ca3e3bd762ff3df7b08057d653