[debian] Move python-unittest2 >= 0.7.0 as runtime dependency
It seems to me that this is not used during Debian package build (tests are
not run), but should be needed at runtime with the cubicweb-dev package.
Also, at the moment, we have no pbuilder setting with this package available
and it blocks the release.
usr/lib/python2*/*-packages/cubicweb/entities/
usr/lib/python2*/*-packages/cubicweb/ext/
usr/share/cubicweb/cubes/
usr/lib/python2*/*-packages/cubicweb/*.py