Add derived node parameter for effective future CPU usage
Add derived node parameter for effective future CPU usage

For balancing CPU load, we take the relative CPU speed into account.
To do so, we have a derived node parameter pCpuEff. Provide a similar
parameter that also takes the forthcoming instances into account.

Signed-off-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>
Reviewed-by: Petr Pudlak <9d19625f8ee825a2c398462ed335cbcf98f79c32@google.com>

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