vhost: add control virtqueue

In order to support multi-queue with VDUSE, having
control queue support is required.

This patch adds control queue implementation, it will be
used later when adding VD

vhost: add control virtqueue

In order to support multi-queue with VDUSE, having
control queue support is required.

This patch adds control queue implementation, it will be
used later when adding VDUSE support. Only split ring
layout is supported for now, packed ring support will be
added later.

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>
Acked-by: David Marchand <david.marchand@redhat.com>

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