[test] Add a "version" to cubicweb_mycube/__pkginfo__.py Starting from Python 3.5, unittest_cwctl.py::CubicWebCtlTC.test_list() would fail without this.

etc/init.d
etc/cubicweb.d
etc/bash_completion.d
usr/bin
usr/share/doc/cubicweb-ctl
var/log/cubicweb
var/lib/cubicweb/backup
var/lib/cubicweb/instances