vmm: Manage the exit and reset behaviours from the control loop

So that we don't need to forward an ExitBehaviour up to the VMM thread.
This simplifies the control loop and the VMM thread even further.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

vmm/src/vm.rs

@@ -436,12 +436,6 @@ pub struct VmInfo<'a> {
     pub vm_cfg: &'a VmConfig,
 }
 
-#[derive(PartialEq)]
-pub enum ExitBehaviour {
-    Shutdown = 1,
-    Reset = 2,
-}
-
 #[derive(Clone, Debug, Deserialize, Serialize)]
 pub enum VmState {
     Created,