Cleanup staking utils to divide functionality between delegate and normal node utitliites. Also replaces vote_states() with more generalized vote_accounts() in Bank. (#3070)

core/src/cluster_info.rs

@@ -877,9 +877,9 @@ impl ClusterInfo {
                 loop {
                     let start = timestamp();
                     let stakes: HashMap<_, _> = match bank_forks {
-                        Some(ref bank_forks) => {
-                            staking_utils::node_stakes(&bank_forks.read().unwrap().working_bank())
-                        }
+                        Some(ref bank_forks) => staking_utils::delegated_stakes(
+                            &bank_forks.read().unwrap().working_bank(),
+                        ),
                         None => HashMap::new(),
                     };
                     let _ = Self::run_gossip(&obj, &stakes, &blob_sender);