pci: keep a stubDriver in each virPCIDevice
This can be set when the virPCIDevice is created and placed on a list, then used later when traversing the list to determine which stub driver to bind/unbind for managed devices. The existing Detach and Attach functions' signatures haven't been changed (they still accept a stub driver name in the arg list), but if the arg list has NULL for stub driver and one is available in the device's object, that will be used. (we may later deprecate and remove the arg from those functions).
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