[cubicweb-ctl] move to accepting only once instance name per command
The rationals behind this decision are:
- while in the past managing all instances sytem wide made a lot of sens,
pratices have evolved today and we've moved to managing one instance by one
- this makes things easier to debug since commands since using them on several
instances were making this harder (errors hidden in the middle)
- also solve the problem of the return code to have, before it was always 0
which prevented to do things like:
ipython --pdb $(which cubicweb-ctl) $command $instance
or shell scripts that used it
- this simplify the code and is always good to take
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