fix default network handling (#2029)

## Issue Addressed
#1992 and #1987, and also to be considered a continuation of #1751

## Proposed Changes
many changed files but most are renaming to align the code with the semantics of `--network` 
- remove the `--network` default value (in clap) and instead set it after checking the `network` and `testnet-dir` flags
- move `eth2_testnet_config` crate to `eth2_network_config`
- move `Eth2TestnetConfig` to `Eth2NetworkConfig`
- move `DEFAULT_HARDCODED_TESTNET` to `DEFAULT_HARDCODED_NETWORK`
- `beacon_node`s `get_eth2_testnet_config` loads the `DEFAULT_HARDCODED_NETWORK` if there is no network nor testnet provided
- `boot_node`s config loads the config same as the `beacon_node`, it was using the configuration only for preconfigured networks (That code is ~1year old so I asume it was not intended)
- removed a one year old comment stating we should try to emulate `https://github.com/eth2-clients/eth2-testnets/tree/master/nimbus/testnet1` it looks outdated (?)
- remove `lighthouse`s `load_testnet_config` in favor of `get_eth2_network_config` to centralize that logic (It had differences)
- some spelling

## Additional Info
Both the command of #1992 and the scripts of #1987 seem to work fine, same as `bn` and `vc`

lcli/Cargo.toml

@@ -23,7 +23,7 @@ regex = "1.3.9"
 futures = { version = "0.3.7", features = ["compat"] }
 environment = { path = "../lighthouse/environment" }
 web3 = "0.11.0"
-eth2_testnet_config = { path = "../common/eth2_testnet_config" }
+eth2_network_config = { path = "../common/eth2_network_config" }
 dirs = "3.0.1"
 genesis = { path = "../beacon_node/genesis" }
 deposit_contract = { path = "../common/deposit_contract" }

lcli/src/eth1_genesis.rs

@@ -1,6 +1,6 @@
 use clap::ArgMatches;
 use environment::Environment;
-use eth2_testnet_config::Eth2TestnetConfig;
+use eth2_network_config::Eth2NetworkConfig;
 use genesis::{Eth1Config, Eth1GenesisService};
 use ssz::Encode;
 use std::cmp::max;
@@ -32,9 +32,9 @@ pub fn run<T: EthSpec>(mut env: Environment<T>, matches: &ArgMatches<'_>) -> Res
                 .expect("should locate home directory")
         });
 
-    let mut eth2_testnet_config = Eth2TestnetConfig::load(testnet_dir.clone())?;
+    let mut eth2_network_config = Eth2NetworkConfig::load(testnet_dir.clone())?;
 
-    let spec = eth2_testnet_config
+    let spec = eth2_network_config
         .yaml_config
         .as_ref()
         .ok_or("The testnet directory must contain a spec config")?
@@ -51,8 +51,8 @@ pub fn run<T: EthSpec>(mut env: Environment<T>, matches: &ArgMatches<'_>) -> Res
         config.endpoints = v;
     }
     config.deposit_contract_address = format!("{:?}", spec.deposit_contract_address);
-    config.deposit_contract_deploy_block = eth2_testnet_config.deposit_contract_deploy_block;
-    config.lowest_cached_block_number = eth2_testnet_config.deposit_contract_deploy_block;
+    config.deposit_contract_deploy_block = eth2_network_config.deposit_contract_deploy_block;
+    config.lowest_cached_block_number = eth2_network_config.deposit_contract_deploy_block;
     config.follow_distance = spec.eth1_follow_distance / 2;
     config.node_far_behind_seconds = max(5, config.follow_distance) * spec.seconds_per_eth1_block;
 
@@ -65,8 +65,8 @@ pub fn run<T: EthSpec>(mut env: Environment<T>, matches: &ArgMatches<'_>) -> Res
                 .wait_for_genesis_state::<T>(ETH1_GENESIS_UPDATE_INTERVAL, spec)
                 .await
                 .map(move |genesis_state| {
-                    eth2_testnet_config.genesis_state_bytes = Some(genesis_state.as_ssz_bytes());
-                    eth2_testnet_config.force_write_to_file(testnet_dir)
+                    eth2_network_config.genesis_state_bytes = Some(genesis_state.as_ssz_bytes());
+                    eth2_network_config.force_write_to_file(testnet_dir)
                 })
                 .map_err(|e| format!("Failed to find genesis: {}", e))?;
 

lcli/src/interop_genesis.rs

@@ -1,7 +1,7 @@
 use clap::ArgMatches;
 use clap_utils::parse_ssz_optional;
 use environment::Environment;
-use eth2_testnet_config::Eth2TestnetConfig;
+use eth2_network_config::Eth2NetworkConfig;
 use genesis::interop_genesis_state;
 use ssz::Encode;
 use std::path::PathBuf;
@@ -36,9 +36,9 @@ pub fn run<T: EthSpec>(mut env: Environment<T>, matches: &ArgMatches) -> Result<
                 .expect("should locate home directory")
         });
 
-    let mut eth2_testnet_config = Eth2TestnetConfig::load(testnet_dir.clone())?;
+    let mut eth2_network_config = Eth2NetworkConfig::load(testnet_dir.clone())?;
 
-    let mut spec = eth2_testnet_config
+    let mut spec = eth2_network_config
         .yaml_config
         .as_ref()
         .ok_or("The testnet directory must contain a spec config")?
@@ -57,8 +57,8 @@ pub fn run<T: EthSpec>(mut env: Environment<T>, matches: &ArgMatches) -> Result<
     let keypairs = generate_deterministic_keypairs(validator_count);
     let genesis_state = interop_genesis_state::<T>(&keypairs, genesis_time, &spec)?;
 
-    eth2_testnet_config.genesis_state_bytes = Some(genesis_state.as_ssz_bytes());
-    eth2_testnet_config.force_write_to_file(testnet_dir)?;
+    eth2_network_config.genesis_state_bytes = Some(genesis_state.as_ssz_bytes());
+    eth2_network_config.force_write_to_file(testnet_dir)?;
 
     Ok(())
 }

lcli/src/new_testnet.rs

@@ -2,7 +2,7 @@ use clap::ArgMatches;
 use clap_utils::{
     parse_optional, parse_path_with_default_in_home_dir, parse_required, parse_ssz_optional,
 };
-use eth2_testnet_config::Eth2TestnetConfig;
+use eth2_network_config::Eth2NetworkConfig;
 use std::path::PathBuf;
 use types::{Address, EthSpec, YamlConfig};
 
@@ -53,7 +53,7 @@ pub fn run<T: EthSpec>(matches: &ArgMatches) -> Result<(), String> {
         spec.genesis_fork_version = v;
     }
 
-    let testnet = Eth2TestnetConfig {
+    let testnet = Eth2NetworkConfig {
         deposit_contract_deploy_block,
         boot_enr: Some(vec![]),
         genesis_state_bytes: None,