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qemu: make number of CPUs used for qemu configurable
The qemu backend is currently only using a single CPU and there
is no way to configure this. This commit adds support to have a
new cpu-count
opton in the project that allows customizing this.
The option name is similar to what AWS uses - I'm happy to adjust
as needed. Other options might be NumCpu
or just Cpu
.
This currently only used with qemu but could easily be used in the other backends too if needed.
There is also a slight factory to make it easier testable.