Provingground: fix syntax error in transporter.py

As is, running the transporter.py code produces
"SyntaxError: invalid syntax".  Add in missing ':'.
Also fix things pylint is complaining about.

BUG=None
TEST=ran it

Change-Id: Id19e4d4990027da86f4880d257302c0779c116ca
Reviewed-on: https://chromium-review.googlesource.com/305211
Commit-Ready: Katherine Threlkeld <kathrelkeld@chromium.org>
Tested-by: Katherine Threlkeld <kathrelkeld@chromium.org>
Reviewed-by: Rohit Makasana <rohitbm@chromium.org>
1 file changed