[c-c list] add an optional argument to the list command (closes #2709703)
This optional argument allows to restrict listing to only
a given type of items (cubes, instances, configurations).
debian/tmp/usr/bin/cubicweb-ctl usr/bin/
debian/tmp/usr/lib/PY_VERSION/site-packages/cubicweb/cwctl.py usr/lib/PY_VERSION/site-packages/cubicweb
debian/cubicweb-ctl.bash_completion etc/bash_completion.d/cubicweb-ctl