add random shuffle util

Signed-off-by: Jason Volk <jason@zemos.net>

src/core/utils/mod.rs

@@ -30,7 +30,7 @@ pub use self::{
 	json::{deserialize_from_str, to_canonical_object},
 	math::clamp,
 	mutex_map::{Guard as MutexMapGuard, MutexMap},
-	rand::string as random_string,
+	rand::{shuffle, string as random_string},
 	stream::{IterStream, ReadyExt, Tools as StreamTools, TryReadyExt},
 	string::{str_from_bytes, string_from_bytes},
 	sys::available_parallelism,