[enh] reduce the number of http outgoing connections.

engines that still use http : gigablast, bing image for thumbnails, 1x and dbpedia autocompleter

searx/engines/dailymotion.py

@@ -60,6 +60,9 @@ def response(resp):
         publishedDate = datetime.fromtimestamp(res['created_time'], None)
         embedded = embedded_url.format(videoid=res['id'])
 
+        # http to https
+        thumbnail = thumbnail.replace("http://", "https://")
+
         results.append({'template': 'videos.html',
                         'url': url,
                         'title': title,