Fix pylint E1101 for youtube modules

Despite the fixed pylint errors, this backend will not work for now...but at least will allow to pass the pylint errors. The problems of this modules are beyond the actual source code because google released a new api which is not implemented here and the old one has been shutdown.

References: #11

coherence/backends/youtube_storage.py

@@ -48,6 +48,7 @@ def __init__(self, uri, id,
         self.cache_maxsize = int(cache_maxsize)
         self.buffer_size = int(buffer_size)
         self.downloader = None
+        self.connection = None
 
         self.video_url = None  # the url we get from the youtube page
         self.stream_url = None  # the real video stream, cached somewhere
@@ -62,7 +63,7 @@ def __init__(self, uri, id,
     def requestFinished(self, result):
         """ self.connection is set in utils.ReverseProxyResource.render """
         self.info("ProxyStream requestFinished: %s", result)
-        if hasattr(self, 'connection'):
+        if self.connection is not None:
             self.connection.transport.loseConnection()
 
     def render(self, request):

coherence/extern/youtubedl/youtubedl.py

@@ -17,6 +17,7 @@
 import sys
 import time
 import urllib
+import urllib.error
 
 from coherence.upnp.core.utils import getPage
 
@@ -336,6 +337,11 @@ def report_finish(self):
         """Report download finished."""
         self.to_stdout('')
 
+    def _do_download(self, *args):
+        raise NotImplementedError('Error: the _do_download method was removed'
+                                  'at some point of the project, operation'
+                                  'cancelled')
+
     def process_info(self, info_dict):
         """Process a single dictionary returned by an InfoExtractor."""
         # Do nothing else if in simulate mode
@@ -373,6 +379,8 @@ def process_info(self, info_dict):
             return
 
         try:
+            # Fixme: This should be reimplemented, probably that the best shoot
+            #  will be to use an external python package to deal with that
             success = self._do_download(filename, info_dict['url'])
         except (urllib.error.URLError,
                 http.client.HTTPException,
@@ -422,7 +430,7 @@ def download(self, url_list):
     def get_real_urls(self, url_list):
         """Download a given list of URLs."""
         if len(url_list) > 1 and self.fixed_template():
-            raise SameFileError(self._params['outtmpl'])
+            raise SameFileError(self.params['outtmpl'])
 
         for url in url_list:
             suitable_found = False
@@ -438,7 +446,7 @@ def got_all_results(all_results):
                         ret_code = self.trouble()
 
                     if len(results) > 1 and self.fixed_template():
-                        raise SameFileError(self._params['outtmpl'])
+                        raise SameFileError(self.params['outtmpl'])
 
                     real_urls = []
                     for result in results: