This patch adds new class distributed_device which is responsible for
initializing HW device and it is shared between all cpus. Old device
class responsibility becomes managing rx/tx queue pair and it is local
per cpu. Each cpu have to call distributed_device::init_local_queue() to
create its own device. The logic to distribute cpus between available
queues (in case there is no enough queues for each cpu) is in the
distributed_device currently and not really implemented yet, so only one
queue or queues == cpus scenarios are supported currently, but this can
be fixed later.
The plan is to rename "distributed_device" to "device" and "device"
to "queue_pair" in later patches.
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