cubicweb #2029571 cubicweb-ctl return code is alway zero [open]

cubicweb-ctl return code is alway 0 even on error.

For example:

% 14:36 pyves@crater1 ~/ > cwc start -D babar
instance babar not started: no such instance babar (check it exists with "cubicweb-ctl list")
% 14:36 pyves@crater1 ~/ > echo $?
0
prioritynormal
typebug
done in<not specified>
closed by<not specified>