Reduce log level from warning to info (fix #71)

docs/changes.rst

@@ -40,6 +40,9 @@ No description yet.
   - Better error messages on wrong login or network problems. Thanks to Antoine
     Pierlot-Garcin for patches to Mopidy and Pyspotify. (Fixes: :issue:`77`)
 
+  - Reduce log level for trivial log messages from warning to info. (Fixes:
+    :issue:`71`)
+
 - Local backend:
 
   - Fix crash in :command:`mopidy-scan` if a track has no artist name. Thanks

mopidy/backends/spotify/playback.py

@@ -23,7 +23,7 @@ class SpotifyPlaybackProvider(BasePlaybackProvider):
             self.backend.output.set_state('PLAYING')
             return True
         except SpotifyError as e:
-            logger.warning('Play %s failed: %s', track.uri, e)
+            logger.info('Playback of %s failed: %s', track.uri, e)
             return False
 
     def resume(self):

mopidy/backends/spotify/translator.py

@@ -60,5 +60,5 @@ class SpotifyTranslator(object):
                 tracks=[cls.to_mopidy_track(t) for t in spotify_playlist],
             )
         except SpotifyError, e:
-            logger.warning(u'Failed translating Spotify playlist '
+            logger.info(u'Failed translating Spotify playlist '
                 '(probably a playlist folder boundary): %s', e)