Comment 2 for bug 1523384

Suggested patch. We need to follow symlinks, so we can find offenders, like this one:

daniel@daydream:~$ dpkg -c /home/daniel/dev/snappy/snapcraft/examples/py3-project/spongeshaker*.snap | grep home
lrwxrwxrwx root/root 0 2015-12-07 11:45 ./usr/lib/python3.5/site-packages -> /home/daniel/dev/snappy/snapcraft/examples/py3-project/parts/spongeshaker/install/usr/lib/python3/dist-packages
daniel@daydream:~$