Inline payment_plan

This module predates Accounts. That was a separate module because
it used to be part of Bank and those types could be sent to any
smart contract. Now each instruction processor defines for itself
what instructions it accepts.

programs/vote_api/src/vote_instruction.rs

@@ -4,7 +4,6 @@ use serde_derive::{Deserialize, Serialize};
 use solana_sdk::instruction::{AccountMeta, Instruction};
 use solana_sdk::pubkey::Pubkey;
 use solana_sdk::system_instruction::SystemInstruction;
-use solana_sdk::transaction::{AccountMeta, Instruction};
 
 #[derive(Serialize, Default, Deserialize, Debug, PartialEq, Eq, Clone)]
 pub struct Vote {