Add NETWORK_ID variable (#2330)

Same variable BOOTNODE_PORT was used for p2p port of bootnode and testnet Chain and Network ID. Adding variable NETWORK_ID to make scripts less confusing and create option to choose arbitrary ID. 

Co-authored-by: Mário Havel <61149543+taxmeifyoucan@users.noreply.github.com>
Co-authored-by: Michael Sproul <michael@sigmaprime.io>

scripts/local_testnet/ganache_test_node.sh

@@ -9,5 +9,5 @@ ganache-cli \
 	--mnemonic "$ETH1_NETWORK_MNEMONIC" \
 	--port 8545 \
 	--blockTime 3 \
-	--networkId 4242 \
-	--chainId 4242
+	--networkId "$NETWORK_ID" \
+	--chainId "$NETWORK_ID"

scripts/local_testnet/setup.sh

@@ -30,7 +30,7 @@ lcli \
 	--min-genesis-time $GENESIS_TIME \
 	--genesis-delay $GENESIS_DELAY \
 	--genesis-fork-version $GENESIS_FORK_VERSION \
-	--eth1-id $BOOTNODE_PORT \
+	--eth1-id $NETWORK_ID \
 	--eth1-follow-distance 1 \
 	--seconds-per-eth1-block 1 \
 	--force
@@ -54,4 +54,4 @@ lcli \
 	--testnet-dir $TESTNET_DIR \
 	$GENESIS_VALIDATOR_COUNT
 
-echo Created genesis state in $TESTNET_DIR
+echo Created genesis state in $TESTNET_DIR

scripts/local_testnet/vars.env

@@ -19,4 +19,9 @@ GENESIS_VALIDATOR_COUNT=80
 NODE_COUNT=4
 
 GENESIS_DELAY=180
+
+# Port for P2P communication with bootnode
 BOOTNODE_PORT=4242
+
+# Network ID and Chain ID of local eth1 test network
+NETWORK_ID=4242