Make methods for seed node address and setup listener creation

This will ease redefining node type (Tor or localhost) and creating more nodes that can report setup result.

network/src/test/java/io/bitsquare/p2p/network/NetworkStressTest.java

@@ -38,13 +38,33 @@ public class NetworkStressTest {
 
         // Create and start the seed node.
         seedNode = new SeedNode(tempDir.toString());
-        final NodeAddress seedNodeAddress = new NodeAddress("localhost:8002");
+        final NodeAddress seedNodeAddress = getSeedNodeAddress();
-        final boolean useLocalhost = true;
+        final boolean useLocalhost = seedNodeAddress.getFullAddress().startsWith("localhost:");
         final Set<NodeAddress> seedNodes = new HashSet<>(1);
         seedNodes.add(seedNodeAddress);  // the only seed node in tests
         seedNode.createAndStartP2PService(seedNodeAddress, useLocalhost,
                 2 /*regtest*/, true /*detailed logging*/, seedNodes,
-                new P2PServiceListener() {
+                getSetupListener(setupFailed, pendingTasks)
+        );
+
+        // Wait for concurrent tasks to finish.
+        pendingTasks.await();
+
+        // Check if any node reported setup failure on start.
+        if (setupFailed.get())
+            throw new Exception("nodes failed to start");
+    }
+
+    @NotNull
+    private static NodeAddress getSeedNodeAddress() {
+        return new NodeAddress("localhost:8002");
+    }
+
+    @NotNull
+    private static P2PServiceListener getSetupListener(
+            final BooleanProperty setupFailed,
+            final CountDownLatch pendingTasks) {
+        return new P2PServiceListener() {
             @Override
             public void onRequestingDataCompleted() {
                 // do nothing
@@ -82,15 +102,7 @@ public class NetworkStressTest {
                 setupFailed.set(true);
                 pendingTasks.countDown();
             }
-                }
+        };
-        );
-
-        // Wait for concurrent tasks to finish.
-        pendingTasks.await();
-
-        // Check if nodes started correctly.
-        if (setupFailed.get())
-            throw new Exception("nodes failed to start");
     }
 
     @After