ipaddress is not stdlib in Python 2

Let's copypaste from StackOverflow instead! https://www.xkcd.com/208/

Also, `localhost:///8096/emby/...` is not a valid HTTP(S) URL.

resources/lib/jellyfin/core/connection_manager.py

@@ -476,6 +476,10 @@ class ConnectionManager(object):
         return None
 
     def _normalize_address(self, address):
+        # TODO: Try HTTPS first, then HTTP if that fails.
+        if '://' not in address:
+            address = 'http://' + address
+
         # Attempt to correct bad input
         url = urllib3.util.parse_url(address.strip())