tools/virtio/ringtest: fix run-on-all.sh to work without /dev/cpu
/dev/cpu is only available on x86 with certain modules (e.g. msr) enabled. Using lscpu to get processors count is more portable. Signed-off-by: NMike Rapoport <rppt@linux.vnet.ibm.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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