Update local testnet scripts, fix eth1 sim (#1184)

* Update local testnet scripts

* Add logs when decrypting validators

* Update comment

* Update account manager

* Make random key generation explicit

* Remove unnecessary clap constraint

* Only decrypt voting keypair for eth1 deposit

* Use insecure kdf for insecure keypairs

* Simplify local testnet keygen

* Update local testnet

* Fix eth1 sim

* Add eth1 sim to CI again

* Remove old local testnet docs

* Tidy

* Remove checks for existing validators

* Tidy

* Fix typos

crypto/eth2_keystore/src/keystore.rs

@@ -97,6 +97,12 @@ impl<'a> KeystoreBuilder<'a> {
         }
     }
 
+    /// Build the keystore using the supplied `kdf` instead of `crate::default_kdf`.
+    pub fn kdf(mut self, kdf: Kdf) -> Self {
+        self.kdf = kdf;
+        self
+    }
+
     /// Consumes `self`, returning a `Keystore`.
     pub fn build(self) -> Result<Keystore, Error> {
         Keystore::encrypt(
@@ -208,6 +214,11 @@ impl Keystore {
         &self.json.pubkey
     }
 
+    /// Returns the key derivation function for the keystore.
+    pub fn kdf(&self) -> &Kdf {
+        &self.json.crypto.kdf.params
+    }
+
     /// Encodes `self` as a JSON object.
     pub fn to_json_string(&self) -> Result<String, Error> {
         serde_json::to_string(self).map_err(|e| Error::UnableToSerialize(format!("{}", e)))