Fix 'urlhandlers' output

mopidy/mpd/handler.py

@@ -974,7 +974,7 @@ class MpdHandler(object):
 
             Gets a list of available URL handlers.
         """
-        return self.backend.uri_handlers
+        return [(u'handler', uri) for uri in self.backend.uri_handlers]
 
     @handle_pattern(r'^clearerror$')
     def _status_clearerror(self):

tests/mpd/handlertest.py

@@ -1120,5 +1120,4 @@ class ReflectionHandlerTest(unittest.TestCase):
     def test_urlhandlers(self):
         result = self.h.handle_request(u'urlhandlers')
         self.assert_(u'OK' in result)
-        result = result[0]
-        self.assert_('dummy:' in result)
+        self.assert_(u'handler: dummy:' in result)