Add support for vm.resize for memory hotplug

[bryteise]

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[bryteise]

@sameo the API documentation seems to indicate that vm.resize for memory can only remove memory from the VM in use. Is that correct?

[sboeuf]

Oh thanks for spotting that @bryteise but the documentation is not complete :(
The vm.resize is meant to be used for both hotplug and hot unplug.

[bryteise]

Thanks, that makes the perfect sense. I just wanted to double check as the documentation for CPU was different.