[subtitles] rename SubitlesIE to SubtitlesInfoExtractor

Otherwise it can be automatically detected as a IE ready for use.

youtube_dl/extractor/dailymotion.py

@@ -4,7 +4,7 @@
 import socket
 
 from .common import InfoExtractor
-from .subtitles import NoAutoSubtitlesIE
+from .subtitles import NoAutoSubtitlesInfoExtractor
 
 from ..utils import (
     compat_http_client,
@@ -18,7 +18,7 @@
 )
 
 
-class DailymotionIE(NoAutoSubtitlesIE):
+class DailymotionIE(NoAutoSubtitlesInfoExtractor):
     """Information Extractor for Dailymotion"""
 
     _VALID_URL = r'(?i)(?:https?://)?(?:www\.)?dailymotion\.[a-z]{2,3}/(?:embed/)?video/([^/]+)'

youtube_dl/extractor/subtitles.py

@@ -10,7 +10,7 @@
 )
 
 
-class SubtitlesIE(InfoExtractor):
+class SubtitlesInfoExtractor(InfoExtractor):
 
     def _list_available_subtitles(self, video_id):
         """ outputs the available subtitles for the video """
@@ -72,7 +72,7 @@ def _request_automatic_caption(self, video_id, webpage):
         pass
 
 
-class NoAutoSubtitlesIE(SubtitlesIE):
+class NoAutoSubtitlesInfoExtractor(SubtitlesInfoExtractor):
     """ A subtitle class for the servers that don't support auto-captions"""
 
     def _request_automatic_caption(self, video_id, webpage):

youtube_dl/extractor/youtube.py

@@ -7,7 +7,7 @@
 import itertools
 
 from .common import InfoExtractor, SearchInfoExtractor
-from .subtitles import SubtitlesIE
+from .subtitles import SubtitlesInfoExtractor
 from ..utils import (
     compat_http_client,
     compat_parse_qs,