test-qdev-global-props: Run tests on subprocess
There are multiple reasons for running the global property tests on a subprocess: * We need the global_props lists to be empty for each test case, so global properties from the previous test won't affect the next one; * We don't want the qdev_prop_check_global() warnings to pollute test output; * With a subprocess, we can ensure qdev_prop_check_global() is printing the warning messages it should. Signed-off-by: NEduardo Habkost <ehabkost@redhat.com> Acked-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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