[generic] Replace LazyYT test with skiplagged

discourse.ubuntu.com has gone away, repalce with skiplagged.com.
Be nice to have a non-frontpage URL that might be more stable,
though I don't have one. Maybe this should move to html
in test/test_InfoExtractor.py?

youtube_dl/extractor/generic.py

@@ -902,12 +902,13 @@ class GenericIE(InfoExtractor):
         },
         # LazyYT
         {
-            'url': 'http://discourse.ubuntu.com/t/unity-8-desktop-mode-windows-on-mir/1986',
+            'url': 'https://skiplagged.com/',
             'info_dict': {
-                'id': '1986',
+                'id': 'skiplagged',
-                'title': 'Unity 8 desktop-mode windows on Mir! - Ubuntu Discourse',
+                'title': 'Skiplagged: The smart way to find cheap flights',
             },
-            'playlist_mincount': 2,
+            'playlist_mincount': 1,
+            'add_ie': ['Youtube'],
         },
         # Cinchcast embed
         {