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

[Gustavo Niemeyer]

> https://bugs.launchpad.net/juju/+bug/809599. This branch modifies juju
> add-unit and juju deploy so that they take a --num-units option (short
> flag is -n) to specify the desired number of units to add. In addition,

It certainly sounds tasteful to have an argument on add-unit and
deploy and also supporting multiple arguments on remove-unit.

Can we please have just the -n option, though?  The long form isn't
necessary in this case IMO.

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Gustavo Niemeyer
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