vm-device: Introduce InterruptManager and InterruptSourceGroup traits

These new traits are meant to abstract the knowledge about the
hypervisor and the type of interrupt being used from the perspective
of the devices.

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

vm-device/src/lib.rs

@@ -2,6 +2,8 @@ extern crate serde;
 extern crate thiserror;
 extern crate vm_memory;
 
+pub mod interrupt;
+
 use vm_memory::{
     Address, GuestAddress, GuestMemory, GuestMemoryMmap, GuestMemoryRegion, GuestRegionMmap,
     MemoryRegionAddress,