Reformat imports to a consistent style for imports

rustfmt.toml configuration:
  imports_granularity = "One"
  group_imports = "One"

sdk/src/account_utils.rs

@@ -1,7 +1,12 @@
 //! useful extras for Account state
-use crate::{account::Account, account::AccountSharedData, instruction::InstructionError};
-use bincode::ErrorKind;
-use std::cell::Ref;
+use {
+    crate::{
+        account::{Account, AccountSharedData},
+        instruction::InstructionError,
+    },
+    bincode::ErrorKind,
+    std::cell::Ref,
+};
 
 /// Convenience trait to covert bincode errors to instruction errors.
 pub trait StateMut<T> {
@@ -60,8 +65,10 @@ where
 
 #[cfg(test)]
 mod tests {
-    use super::*;
-    use crate::{account::AccountSharedData, pubkey::Pubkey};
+    use {
+        super::*,
+        crate::{account::AccountSharedData, pubkey::Pubkey},
+    };
 
     #[test]
     fn test_account_state() {