message: [cli] check JSON RPC response in minting
  Closes:
  Approved by: xli
diff: @@ -488,7 +488,7 @@ impl ClientProxy {
  } else {
  // We can't determine the account state. So try and create the account, but
  // if it already exists don't error.
  - let _ = self.association_transaction_with_local_libra_root_account(
  + let _result = self.association_transaction_with_local_libra_root_account(
  TransactionPayload::Script(script),
  true,
  );
  @@ -1444,14 +1444,14 @@ impl ClientProxy {
  let sender_address = sender.address;
  let txn = self.create_txn_to_submit(payload, sender, None, None, None)?;
  let mut sender_mut = self.libra_root_account.as_mut().unwrap();
  - let resp = self.client.submit_transaction(Some(&mut sender_mut), txn);
  + self.client.submit_transaction(Some(&mut sender_mut), txn)?;
  if is_blocking {
  self.wait_for_transaction(
  sender_address,
  self.libra_root_account.as_ref().unwrap().sequence_number,
  )?;
  }
  - resp
  + Ok(())
  }
  fn association_transaction_with_local_testnet_dd_account(
  @@ -1467,7 +1467,7 @@ impl ClientProxy {
  let sender_address = sender.address;
  let txn = self.create_txn_to_submit(payload, sender, None, None, None)?;
  let mut sender_mut = self.testnet_designated_dealer_account.as_mut().unwrap();
  - let resp = self.client.submit_transaction(Some(&mut sender_mut), txn);
  + self.client.submit_transaction(Some(&mut sender_mut), txn)?;
  if is_blocking {
  self.wait_for_transaction(
  sender_address,
  @@ -1477,7 +1477,7 @@ impl ClientProxy {
  .sequence_number,
  )?;
  }
  - resp
  + Ok(())
  }
  fn mint_coins_with_faucet_service(
  