Thread execution layer into ClientBuilder

beacon_node/client/src/config.rs

@@ -74,6 +74,7 @@ pub struct Config {
     pub network: network::NetworkConfig,
     pub chain: beacon_chain::ChainConfig,
     pub eth1: eth1::Config,
+    pub execution_endpoints: Option<Vec<SensitiveUrl>>,
     pub http_api: http_api::Config,
     pub http_metrics: http_metrics::Config,
     pub monitoring_api: Option<monitoring_api::Config>,
@@ -94,6 +95,7 @@ impl Default for Config {
             dummy_eth1_backend: false,
             sync_eth1_chain: false,
             eth1: <_>::default(),
+            execution_endpoints: None,
             disabled_forks: Vec::new(),
             graffiti: Graffiti::default(),
             http_api: <_>::default(),