iotests: Warn if python subprocess is killed
Currently, if a subprocess of a python test (i.e. qemu-io, qemu-img, or qemu) receives a signal and is subsequently aborted, this is not logged. This patch makes python tests always check the exit code of these subprocesses, and emit a message if they have been killed. Signed-off-by: NMax Reitz <mreitz@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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