Description
#### Problem
We currently display a vote account info on the CLI as follows:
```
$ solana vote-account vote.json
Account Balance: 0.02685864 SOL
Validator Identity: 7hguFUbg1pbkSppuwfZ1i9n9Wrqs22J4nLRepGnjvniW
Vote Authority: {2: "7hguFUbg1pbkSppuwfZ1i9n9Wrqs22J4nLRepGnjvniW"}
Withdraw Authority: 7hguFUbg1pbkSppuwfZ1i9n9Wrqs22J4nLRepGnjvniW
Credits: 0
Commission: 100%
Root Slot: ~
Recent Timestamp: BlockTimestamp { slot: 0, timestamp: 0 }
```
The line `Vote Authority: {2: "7hguFUbg1pbkSppuwfZ1i9n9Wrqs22J4nLRepGnjvniW"}` is not clear what the two values represents, which is: epoch: authorized_voter. So if you authorize a new voter, it should be reported there, keyed to the epoch it changed.
#### Proposed Solution
- Change `Vote Authority` line to just display the pubkey of the vote auth, same format as withdraw auth.
- Add a separate line for the epoch change data, like: `Vote Authority last changed during Epoch: [epoch]`