Constant cfxcore::consensus_internal_parameters::REWARD_EPOCH_COUNT

pub const REWARD_EPOCH_COUNT: u64 = 12; // 12u64

REWARD_EPOCH_COUNT needs to be larger than ANTICONE_PENALTY_UPPER_EPOCH_COUNT. If we cannot cache receipts of recent REWARD_EPOCH_COUNT epochs, the receipts will be loaded from db, which may lead to performance downgrade