vmm: Move restore parameters into common RestoreConfig structure

The goal here is to move the restore parameters into a dedicated
structure that can be reused from the entire codebase, making the
addition or removal of a parameter easier.

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

vmm/src/vm.rs

@@ -188,6 +188,9 @@ pub enum Error {
 
     /// Cannot send VM snapshot
     SnapshotSend(MigratableError),
+
+    /// Cannot convert source URL from Path into &str
+    RestoreSourceUrlPathToStr,
 }
 pub type Result<T> = result::Result<T, Error>;