Fix test on parallel execution.

Author: dkocher

ftp/src/test/java/ch/cyberduck/core/ftp/AbstractFTPTest.java

@@ -60,7 +60,7 @@
 
 public class AbstractFTPTest {
 
-    private static final int PORT_NUMBER = ThreadLocalRandom.current().nextInt(2000, 3000);
+    private final int PORT_NUMBER = ThreadLocalRandom.current().nextInt(2000, 3000);
 
     protected FTPSession session;
 

webdav/src/test/java/ch/cyberduck/core/dav/AbstractDAVTest.java

@@ -89,7 +89,7 @@ public class AbstractDAVTest extends VaultTest {
     protected DAVSession session;
 
     private SimpletonServer server;
-    private static final int PORT_NUMBER = ThreadLocalRandom.current().nextInt(2000, 3000);
+    private final int PORT_NUMBER = ThreadLocalRandom.current().nextInt(2000, 3000);
 
     @Parameterized.Parameters(name = "vaultVersion = {0}")
     public static Object[] data() {