[consensus] remove WAL separator (Refs #785)

We don't really need a separator unless we have complex structures
(rows, cells like RDBMS have https://www.sqlite.org/fileformat.html).

rpc/test/helpers.go

@@ -51,7 +51,7 @@ func makePathname() string {
 	if err != nil {
 		panic(err)
 	}
-	fmt.Println(p)
+	// fmt.Println(p)
 	sep := string(filepath.Separator)
 	return strings.Replace(p, sep, "_", -1)
 }