vpython_wrapper: new wrapper entry point

This is Python 2 wrapper for use in older branches.

BUG=chromium:1196328
TEST=`./bin/cros_sdk` in old firmware branch works

Change-Id: I2a81191db4b77ccaab7c92c33508faccce0e6d25
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/2893104
Commit-Queue: LaMont Jones <[email protected]>
Reviewed-by: LaMont Jones <[email protected]>
Tested-by: LaMont Jones <[email protected]>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/3040462
Tested-by: Mike Frysinger <[email protected]>
Commit-Queue: Mike Frysinger <[email protected]>
Reviewed-by: Greg Edelston <[email protected]>
2 files changed