Use schlesi as default testnet (#1108)

* Use schlesi as default testnet

* Add schlesi dir to gitignore

lighthouse/Cargo.toml

@@ -23,3 +23,4 @@ futures = "0.1.25"
 validator_client = { "path" = "../validator_client" }
 account_manager = { "path" = "../account_manager" }
 clap_utils = { path = "../eth2/utils/clap_utils" }
+eth2_testnet_config = { path = "../eth2/utils/eth2_testnet_config" }

lighthouse/src/main.rs

@@ -6,6 +6,7 @@ use clap::{App, Arg, ArgMatches};
 use clap_utils;
 use env_logger::{Builder, Env};
 use environment::EnvironmentBuilder;
+use eth2_testnet_config::HARDCODED_TESTNET;
 use slog::{crit, info, warn};
 use std::path::PathBuf;
 use std::process::exit;
@@ -156,6 +157,14 @@ fn run<E: EthSpec>(
         "Ethereum 2.0 is pre-release. This software is experimental."
     );
 
+    if !matches.is_present("testnet-dir") {
+        info!(
+            log,
+            "Using default testnet";
+            "default" => HARDCODED_TESTNET
+        )
+    }
+
     // Note: the current code technically allows for starting a beacon node _and_ a validator
     // client at the same time.
     //