[migration] make 'session' object be a server-side Connection, not ClientConnection I think this better corresponds to the previous behaviour. However, that Connection does not have a cnxset, which should probably be changed (for both interactive_shell and cmd_process_script).

missing-dep-for-interpreter make => make | build-essential | dpkg-dev (usr/share/pyshared/cubicweb/skeleton/debian/rules.tmpl)