encryption: import macros with the use syntax (tikv#9951)

Signed-off-by: lhy1024 <[email protected]>

Co-authored-by: Ti Chi Robot <[email protected]>

components/encryption/export/examples/ecli.rs

@@ -1,8 +1,5 @@
 // Copyright 2020 TiKV Project Authors. Licensed under Apache-2.0.
 
-#[macro_use]
-extern crate tikv_util;
-
 use std::io::{Read, Write};
 
 pub use cloud::kms::Config as CloudConfig;
@@ -15,6 +12,7 @@ use kvproto::encryptionpb::EncryptedContent;
 use protobuf::Message;
 use structopt::clap::arg_enum;
 use structopt::StructOpt;
+use tikv_util::box_err;
 
 arg_enum! {
     #[derive(Debug)]

components/encryption/export/src/lib.rs

@@ -1,12 +1,9 @@
-#![feature(min_specialization)]
-#[macro_use]
-extern crate slog_global;
-
 use async_trait::async_trait;
 use derive_more::Deref;
 use error_code::{self, ErrorCode, ErrorCodeExt};
 use std::fmt::Debug;
 use std::path::Path;
+use tikv_util::error;
 use tikv_util::impl_format_delegate_newtype;
 use tikv_util::stream::RetryError;