Re: [libvirt] [PATCH v3 5/6] qemu_driver: BaselineHypervisorCPU support for S390

Libvirt can compute baseline hypervisor cpu from list of S390 cpu models by using QEMU QMP messages to compute baseline within QEMU. QEMU only baselines one pair of CPU models per query so a sequence of multiple QMP queries are needed if more than two CPU models are baselined. Full expansion of baseline S390 model supported using QEMU QMP messages to compute expansion within QEMU. Introduces qemuMonitorCPUModelInfoRemovePropByBoolValue to remove props by value as required to convert between cpu model property lists that indicate if property is or isn't include in model with true / false value and the form of cpu model property lists that only enumerate properties that are actually included in the model. Introduces functions for virCPUDef / qemuMonitorCPUModelInfo conversion.