[r=dave-cheney],[bug=1298770] unit.SetAddress now takes a vararg
Update LP#1298770
The previous branch updated instance.NewAddress to be varargs and demonstated that most callers of NewAddresses were used to get a slice of addresses so they could pass them to unit.SetAddresses. By making SetAddresses vararg NewAddresses is unneeded. This will be the next change.
https://codereview.appspot.com/82390045/