Libp2p connection limits (#2272)

* max peers gets set as connection limits

* pass max connections

beacon_chain/eth2_network.nim

@@ -1526,7 +1526,13 @@ proc newBeaconSwitch*(conf: BeaconNodeConf, seckey: PrivateKey,
 
   let identify = newIdentify(peerInfo)
 
-  newSwitch(peerInfo, transports, identify, muxers, secureManagers)
+  newSwitch(
+    peerInfo,
+    transports,
+    identify,
+    muxers,
+    secureManagers,
+    maxConnections = conf.maxPeers)
 
 proc createEth2Node*(rng: ref BrHmacDrbgContext,
                      conf: BeaconNodeConf,

scripts/launch_local_testnet.sh

@@ -373,7 +373,7 @@ for NUM_NODE in $(seq 0 $(( NUM_NODES - 1 ))); do
     --log-level="${LOG_LEVEL}" \
     --tcp-port=$(( BASE_PORT + NUM_NODE )) \
     --udp-port=$(( BASE_PORT + NUM_NODE )) \
-    --max-peers=$(( NUM_NODES - 1 )) \
+    --max-peers=$(( NUM_NODES * 2 - 1 )) \
     --data-dir="${NODE_DATA_DIR}" \
     ${BOOTSTRAP_ARG} \
     ${STATE_SNAPSHOT_ARG} \

vendor/nim-libp2p

@@ -1 +1 @@
-Subproject commit 0959877b29be802b857cb10ab194f5cf29e3649f
+Subproject commit 1d77d37f17a8d4b9bbafb83eae69790dad48b4c5