migration: Use MemoryManager restore code path

Instead of creating a MemoryManager from scratch, let's reuse the same
code path used by snapshot/restore, so that memory regions are created
identically to what they were on the source VM.

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

vm-migration/src/protocol.rs

@@ -174,13 +174,13 @@ impl Response {
 unsafe impl ByteValued for Response {}
 
 #[repr(C)]
-#[derive(Clone, Versionize)]
+#[derive(Clone, Serialize, Deserialize, Versionize)]
 pub struct MemoryRange {
     pub gpa: u64,
     pub length: u64,
 }
 
-#[derive(Clone, Default, Versionize)]
+#[derive(Clone, Default, Serialize, Deserialize, Versionize)]
 pub struct MemoryRangeTable {
     data: Vec<MemoryRange>,
 }