Refactor main validator service

validator_client/src/main.rs

@@ -8,6 +8,7 @@ mod signer;
 
 use crate::config::Config as ValidatorClientConfig;
 use clap::{App, Arg};
+use protos::services_grpc::ValidatorServiceClient;
 use service::Service as ValidatorService;
 use slog::{error, info, o, Drain};
 
@@ -53,7 +54,8 @@ fn main() {
         .expect("Unable to build a configuration for the validator client.");
 
     // start the validator service.
-    match ValidatorService::start(config, log.clone()) {
+    // this specifies the GRPC type to use as the duty manager beacon node.
+    match ValidatorService::<ValidatorServiceClient>::start(config, log.clone()) {
         Ok(_) => info!(log, "Validator client shutdown successfully."),
         Err(e) => error!(log, "Validator exited due to: {}", e.to_string()),
     }