NUTCH-3144 URLUtil unit tests fail after upgrade to crawler-commons 1.6

- adapt unit tests to changes introduced in
  crawler-commons/crawler-commons#478
- test for example given in Javadoc of getDomainSuffix

Author: sebastian-nagel

src/java/org/apache/nutch/util/URLUtil.java

@@ -262,7 +262,7 @@ public static String getDomainSuffix(URL url) {
 
     EffectiveTldFinder.EffectiveTLD suffix = EffectiveTldFinder.getEffectiveTLD(host, true);
     if (suffix != null) {
-      return suffix.getDomain();
+      return suffix.getSuffix();
     }
 
     return null;

src/test/org/apache/nutch/util/TestURLUtil.java

@@ -147,6 +147,8 @@ public void testGetDomainSuffix() throws Exception {
     assertEquals("2000.hu", URLUtil.getDomainSuffix(url));
 
     // test non-ASCII
+    url = new URL("https://www.taiuru.māori.nz/");
+    assertEquals("xn--mori-qsa.nz", URLUtil.getDomainSuffix(url));
     url = new URL("http://www.example.flå.no");
     assertEquals("xn--fl-zia.no", URLUtil.getDomainSuffix(url));
     url = new URL("http://www.example.栃木.jp");