[zingmp3:album] Add support for playlists

Update for work with playlist, it same album but different url
Ex:
http://mp3.zing.vn/playlist/Duong-Hong-Loan-apollobee/IWCAACCB.html
http://mp3.zing.vn/album/Duong-Hong-Loan-apollobee/IWCAACCB.html

youtube_dl/extractor/zingmp3.py

@@ -85,16 +85,22 @@ class ZingMp3SongIE(ZingMp3BaseInfoExtractor):
 
 
 class ZingMp3AlbumIE(ZingMp3BaseInfoExtractor):
-    _VALID_URL = r'https?://mp3\.zing\.vn/album/(?P<slug>[^/]+)/(?P<album_id>\w+)\.html'
-    _TESTS = [{
-        'url': 'http://mp3.zing.vn/album/Lau-Dai-Tinh-Ai-Bang-Kieu-Minh-Tuyet/ZWZBWDAF.html',
-        'info_dict': {
-            '_type': 'playlist',
-            'id': 'ZWZBWDAF',
-            'title': 'Lâu Đài Tình Ái - Bằng Kiều ft. Minh Tuyết | Album 320 lossless',
+    _VALID_URL = r'https?://mp3\.zing\.vn/(?:album|playlist)/(?P<slug>[^/]+)/(?P<album_id>\w+)\.html'
+    _TESTS = [
+        {
+            'url': 'http://mp3.zing.vn/album/Lau-Dai-Tinh-Ai-Bang-Kieu-Minh-Tuyet/ZWZBWDAF.html',
+            'info_dict': {
+                '_type': 'playlist',
+                'id': 'ZWZBWDAF',
+                'title': 'Lâu Đài Tình Ái - Bằng Kiều ft. Minh Tuyết | Album 320 lossless',
+            },
+            'playlist_count': 10,
         },
-        'playlist_count': 10,
-    }]
+        {
+            'url': 'http://mp3.zing.vn/playlist/Duong-Hong-Loan-apollobee/IWCAACCB.html',
+            'only_matching': True,
+        }
+    ]
     IE_NAME = 'zingmp3:album'
     IE_DESC = 'mp3.zing.vn albums'