Add symlink to pythonic cros_workon replacement

BUG=brillo:817
TEST=common workflows (e.g. starting/stopping packages, listing
packages, list-all, iterate seem to work in similar ways for both
scripts).

Change-Id: I4597266f45d8c8871d7d8ada1d10e791f9b121fd
Reviewed-on: https://chromium-review.googlesource.com/265747
Reviewed-by: Bertrand Simonnet <bsimonnet@chromium.org>
Trybot-Ready: Christopher Wiley <wiley@chromium.org>
Tested-by: Christopher Wiley <wiley@chromium.org>
Commit-Queue: Christopher Wiley <wiley@chromium.org>
2 files changed