Realize the symmetric algorithm control queue handler,
including plain cipher and chainning algorithms.

Currently the control queue is used to create and
close session for symmetric algorithm.
Signed-off-by: NGonglei <arei.gonglei@huawei.com>
Reviewed-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>