Strip out old code

All of these files have been moved to either:

- https://github.com/sigp/lighthouse-beacon
- https://github.com/sigp/lighthouse-validator
- https://github.com/sigp/lighthouse-common

For rationale, see: https://github.com/sigp/lighthouse/issues/197

beacon_node/src/rpc/mod.rs

@@ -1,36 +0,0 @@
-mod beacon_block;
-mod validator;
-
-use self::beacon_block::BeaconBlockServiceInstance;
-use self::validator::ValidatorServiceInstance;
-use grpcio::{Environment, Server, ServerBuilder};
-use protos::services_grpc::{create_beacon_block_service, create_validator_service};
-use std::sync::Arc;
-
-use slog::{info, Logger};
-
-pub fn start_server(log: Logger) -> Server {
-    let log_clone = log.clone();
-    let env = Arc::new(Environment::new(1));
-
-    let beacon_block_service = {
-        let instance = BeaconBlockServiceInstance { log: log.clone() };
-        create_beacon_block_service(instance)
-    };
-    let validator_service = {
-        let instance = ValidatorServiceInstance { log: log.clone() };
-        create_validator_service(instance)
-    };
-
-    let mut server = ServerBuilder::new(env)
-        .register_service(beacon_block_service)
-        .register_service(validator_service)
-        .bind("127.0.0.1", 50_051)
-        .build()
-        .unwrap();
-    server.start();
-    for &(ref host, port) in server.bind_addrs() {
-        info!(log_clone, "gRPC listening on {}:{}", host, port);
-    }
-    server
-}