Add get_signature_status() to SyncClient

And move bank::Result to transaction module.

runtime/src/bank_client.rs

@@ -7,7 +7,7 @@ use solana_sdk::signature::Signature;
 use solana_sdk::signature::{Keypair, KeypairUtil};
 use solana_sdk::sync_client::SyncClient;
 use solana_sdk::system_instruction;
-use solana_sdk::transaction::Transaction;
+use solana_sdk::transaction::{self, Transaction};
 use solana_sdk::transport::Result;
 use std::io;
 
@@ -79,6 +79,13 @@ impl<'a> SyncClient for BankClient<'a> {
     fn get_balance(&self, pubkey: &Pubkey) -> Result<u64> {
         Ok(self.bank.get_balance(pubkey))
     }
+
+    fn get_signature_status(
+        &self,
+        signature: &Signature,
+    ) -> Result<Option<transaction::Result<()>>> {
+        Ok(self.bank.get_signature_status(signature))
+    }
 }
 
 impl<'a> BankClient<'a> {