Change the pin strategy if host doesn't have enough nodes

We might launch multiple guests in one physical host,
each guest has many vcpus and vhost threads, some external
processes also need to be pined to a single node in some
tests (eg: netperf).

In some physical host, it doesn't have enough nodes.
After supported multiple-queue, the condition gets worse.

This patch addes a pin strategy for different condition.

| if #vcpus_threads + #vhosts_threads < #numa_nodes
|     each vcpus/vhosts thread will be pined in one node
| else if #vcpus_threads < #numa_node
|     each pair of vcpu & vhost threads will be pined in one node
| else
|     do nothing

Signed-off-by: Amos Kong <akong@redhat.com>
enable msix vectors for all the tests

Signed-off-by: Amos Kong <akong@redhat.com>
netperf: count interrupt for each queue

When we enable multiple queue, there are multiple virtio
input/output interrupts in guest.

This patch counts interrupt for each queue, and output
a summary in result.

Signed-off-by: Amos Kong <akong@redhat.com>