python-pypcap: Bump version and change site

Google Code is a closing forge, python-pypcap has already made the
move to Github.

We are not using the latest available tag as it dates back from 2005,
and ~20 more commits have been made after the last tag. Therefore,
we're using the latest commit.

Signed-off-by: Maxime Hadjinlian <maxime.hadjinlian@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>