snapshot-test: mock query-savevm better

Otherwise the new printing functions produce warnings about undefined
numbers. These stats are guaranteed to be returned by real QEMU, so mock
them with some sensible values.

Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>

test/snapshot-test.pm

@@ -342,7 +342,11 @@ sub qmp_cmd {
 	return;
     }
     if ($exec eq "query-savevm") {
-	return { "status" => "completed" };
+	return {
+	    "status" => "completed",
+	    "bytes" => 1024*1024*1024,
+	    "total-time" => 5000,
+        };
     }
     die "unexpected vm_qmp_command!\n";
 }