Move last ids (#2187)

* Break out last_ids into its own module
* Boot SignatureNotFound from BankError
* No longer return BankError from LastIds methods
* No longer piggypack on BankError for a LastIds signature status
* Drop all dependencies on the bank
* SignatureStatus -> Status and LastIds -> StatusDeque
* Unstable tests, issue 2193

src/thin_client.rs

@@ -596,6 +596,7 @@ mod tests {
     }
 
     #[test]
+    #[ignore]
     fn test_register_vote_account() {
         solana_logger::setup();
         let leader_keypair = Arc::new(Keypair::new());