/usr/lib/python2.7/dist-packages/zope.app.rotterdam-3.5.3-nspkg.pth is in python-zope.app.rotterdam 3.5.3-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/../../../share/pyshared/zope.app.rotterdam-3.5.3-nspkg.pth