BtcNetworkConfig: Shuffle Bitcoin Core peers

We try to connect to the first 7 Bitcoin Core nodes always in the same
order. Only if connections to these nodes fail we look further into the
list. This change shuffles the node addresses before passing them to
BitcoinJ thus removing the bias from the first 7 prioritized nodes.

core/src/main/java/bisq/core/btc/nodes/BtcNetworkConfig.java

@@ -29,6 +29,7 @@
 
 import com.runjva.sourceforge.jsocks.protocol.Socks5Proxy;
 
+import java.util.Collections;
 import java.util.List;
 
 import org.slf4j.Logger;
@@ -56,6 +57,7 @@ public BtcNetworkConfig(WalletConfig delegate, NetworkParameters parameters, int
     public void proposePeers(List<PeerAddress> peers) {
         if (!peers.isEmpty()) {
             log.info("You connect with peerAddresses: {}", peers);
+            Collections.shuffle(peers);
             PeerAddress[] peerAddresses = peers.toArray(new PeerAddress[0]);
             delegate.setPeerNodes(peerAddresses);
         } else if (proxy != null) {