devices: Move to versioned snapshots

Signed-off-by: Rob Bradford <robert.bradford@intel.com>

Cargo.lock

@@ -1,5 +1,7 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+version = 3
+
 [[package]]
 name = "acpi_tables"
 version = "0.1.0"
@@ -253,9 +255,8 @@ dependencies = [
  "epoll",
  "libc",
  "log 0.4.14",
- "serde",
- "serde_derive",
- "serde_json",
+ "versionize",
+ "versionize_derive",
  "vm-device",
  "vm-memory",
  "vm-migration",