Set web3signer keep-alive to 20s by default (#5587)

* Set web3signer keep-alive to 20s by default

* add tests

validator_client/src/cli.rs

@@ -391,7 +391,7 @@ pub fn cli_app<'a, 'b>() -> App<'a, 'b> {
             Arg::with_name("web3-signer-keep-alive-timeout")
                 .long("web3-signer-keep-alive-timeout")
                 .value_name("MILLIS")
-                .default_value("90000")
+                .default_value("20000")
                 .help("Keep-alive timeout for each web3signer connection. Set to 'null' to never \
                        timeout")
                 .takes_value(true),

validator_client/src/config.rs

@@ -18,6 +18,7 @@ use std::time::Duration;
 use types::{Address, GRAFFITI_BYTES_LEN};
 
 pub const DEFAULT_BEACON_NODE: &str = "http://localhost:5052/";
+pub const DEFAULT_WEB3SIGNER_KEEP_ALIVE: Option<Duration> = Some(Duration::from_secs(20));
 
 /// Stores the core configuration for this validator instance.
 #[derive(Clone, Serialize, Deserialize)]
@@ -133,7 +134,7 @@ impl Default for Config {
             builder_boost_factor: None,
             prefer_builder_proposals: false,
             distributed: false,
-            web3_signer_keep_alive_timeout: Some(Duration::from_secs(90)),
+            web3_signer_keep_alive_timeout: DEFAULT_WEB3SIGNER_KEEP_ALIVE,
             web3_signer_max_idle_connections: None,
         }
     }

validator_client/src/lib.rs

@@ -3,7 +3,6 @@ mod beacon_node_fallback;
 mod block_service;
 mod check_synced;
 mod cli;
-mod config;
 mod duties_service;
 mod graffiti_file;
 mod http_metrics;
@@ -14,6 +13,7 @@ mod preparation_service;
 mod signing_method;
 mod sync_committee_service;
 
+pub mod config;
 mod doppelganger_service;
 pub mod http_api;
 pub mod initialized_validators;