vmm: Reorganize DeviceManager creation

This commit performs the split of the DeviceManager's creation into two
separate functions by moving anything related to device's creation after
the DeviceManager structure has been initialized.

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

vmm/src/vm.rs

@@ -334,6 +334,12 @@ impl Vm {
         )
         .map_err(Error::DeviceManager)?;
 
+        device_manager
+            .lock()
+            .unwrap()
+            .create_devices()
+            .map_err(Error::DeviceManager)?;
+
         let cpu_manager = cpu::CpuManager::new(
             &config.lock().unwrap().cpus.clone(),
             &device_manager,