Packet filter cli option (#2523)

## Issue Addressed

N/A

## Proposed Changes

Adds a cli option to disable packet filter in `lighthouse bootnode`. This is useful in running local testnets as the bootnode bans requests from the same ip(localhost) if the packet filter is enabled.

scripts/local_testnet/beacon_node.sh

@@ -21,4 +21,5 @@ exec lighthouse \
 	--enr-tcp-port $2 \
 	--port $2 \
 	--http-port $3 \
+	--disable-packet-filter \
 	--target-peers $((NODE_COUNT - 1))