Move Cloud Hypervisor to virtio-queue crate

Relying on the vm-virtio/virtio-queue crate from rust-vmm which has been
copied inside the Cloud Hypervisor tree, the entire codebase is moved to
the new definition of a Queue and other related structures.

The reason for this move is to follow the upstream until we get some
agreement for the patches that we need on top of that to make it
properly work with Cloud Hypervisor.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>

virtio-devices/src/vsock/mod.rs

@@ -75,6 +75,8 @@ pub enum VsockError {
     GuestMemoryBounds,
     /// The vsock header descriptor length is too small.
     HdrDescTooSmall(u32),
+    /// The vsock header descriptor is expected, but missing.
+    HdrDescMissing,
     /// The vsock header `len` field holds an invalid value.
     InvalidPktLen(u32),
     /// A data fetch was attempted when no data was available.
@@ -168,10 +170,9 @@ mod tests {
     use std::os::unix::io::AsRawFd;
     use std::path::PathBuf;
     use std::sync::{Arc, RwLock};
+    use virtio_queue::{defs::VIRTQ_DESC_F_NEXT, defs::VIRTQ_DESC_F_WRITE, Queue};
     use vm_memory::{GuestAddress, GuestMemoryAtomic};
     use vm_virtio::queue::testing::VirtQueue as GuestQ;
-    use vm_virtio::queue::Queue;
-    use vm_virtio::queue::{VIRTQ_DESC_F_NEXT, VIRTQ_DESC_F_WRITE};
     use vmm_sys_util::eventfd::EventFd;
 
     pub struct NoopVirtioInterrupt {}
@@ -180,7 +181,7 @@ mod tests {
         fn trigger(
             &self,
             _int_type: &VirtioInterruptType,
-            _queue: Option<&Queue>,
+            _queue: Option<&Queue<GuestMemoryAtomic<GuestMemoryMmap>>>,
         ) -> std::result::Result<(), std::io::Error> {
             Ok(())
         }