Support forthcoming in LUIntanceCreate
Support forthcoming in LUIntanceCreate

If a forthcoming instance is requested, we just reserve the resources,
but don't create the instance itself.

Signed-off-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>
Reviewed-by: Niklas Hambuechen <98215d3a72cb13cc9c9956528e50119ca7d1fb8b@google.com>

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