Add support for two i386 pm options which control acpi hotplug

[Ani Sinha]

Hi :

The previous patch I sent was half baked and had issues. I am sending the
fixed patch complete with added unit tests for the new libvirt xml options.

The first patch in the series is the actual change. It also adds related
schema modifications. Additionally, it makes the necessary capability
additions as well.
The second patch in the series is the related unit tests for this feature.
The unit tests all pass when run.

[PATCH 1/2] pm/i386: add support for two options that controls acpi
[PATCH 2/2] tests: add unit tests to exercize pm options that control

I hope I shall get some traction on this. Please provide feedback and
suggestions.

Thanks
ani