API change: juju CLI support for adding/removing multiple service units at once

[Gustavo Niemeyer]

> -n|--num-units seems the right way to go then, just give us the short
> and long versions.

Let's please stick with "-n" only. You were happy with no arguments at
all, so it shouldn't be a big deal to not have the long version.

-- 
Gustavo Niemeyer
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