If a cpu_affinity node of SOS is not present in the scenario.xml,
assign the native cpus which are not assigned to pre-launched vm to
SOS vm.
Tracked-On: #5980
Signed-off-by: Yang,Yu-chu <yu-chu.yang@intel.com>
Reviewed-by: Junjie Mao <junjie.mao@intel.com>
Yang,Yu-chu