qemu: Drop MSR features from host-model with old QEMU
With QEMU versions which lack "unavailable-features" we use CPUID based detection of features which were enabled or disabled once QEMU starts. Thus using MSR features with host-model would result in all of them being marked as disabled in the active domain definition even though QEMU did not actually disable them. Let's make sure we add MSR features to host-model only when "unavailable-features" property is supported by QEMU. Signed-off-by: NJiri Denemark <jdenemar@redhat.com> Reviewed-by: NJán Tomko <jtomko@redhat.com>
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