vote_api cleanup (#3710)

* vote_api cleanup

* fixups

* fixup

* remove unused code

* revert removal of serialize and deserialize

* ...

* increase coverage, bootstrap staking

* Sagar's STAKE to my VOTE

fullnode/src/main.rs

@@ -32,11 +32,11 @@ fn main() {
                 .help("File containing an identity (keypair)"),
         )
         .arg(
-            Arg::with_name("staking_account")
-                .long("staking-account")
+            Arg::with_name("vote_account")
+                .long("vote-account")
                 .value_name("PUBKEY_BASE58_STR")
                 .takes_value(true)
-                .help("Public key of the staking account, where to send votes"),
+                .help("Public key of the vote account, where to send votes"),
         )
         .arg(
             Arg::with_name("voting_keypair")