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

scripts/local_testnet/setup.sh

@@ -0,0 +1,36 @@
+#!/bin/bash
+
+#
+# Produces a testnet specification and a genesis state where the genesis time
+# is now.
+#
+
+source ./vars.env
+
+lcli \
+	--spec mainnet \
+	new-testnet \
+	--deposit-contract-address 0000000000000000000000000000000000000000 \
+	--testnet-dir $TESTNET_DIR \
+	--min-genesis-active-validator-count $VALIDATOR_COUNT \
+	--force
+
+echo Specification generated at $TESTNET_DIR.
+echo "Generating $VALIDATOR_COUNT validators concurrently... (this may take a while)"
+
+lcli \
+	insecure-validators \
+	--count $VALIDATOR_COUNT \
+	--validators-dir $VALIDATORS_DIR \
+	--secrets-dir $SECRETS_DIR
+
+echo Validators generated at $VALIDATORS_DIR with keystore passwords at $SECRETS_DIR.
+echo "Building genesis state... (this might take a while)"
+
+lcli \
+	--spec mainnet \
+	interop-genesis \
+	--testnet-dir $TESTNET_DIR \
+	$VALIDATOR_COUNT
+
+echo Created genesis state in $TESTNET_DIR