urlparse.urlparse call in transfertool interface is wrong
Motivation
----------
This was changed in a recent PR, however, the call on `urlparse.urlparse` is wrong, `urlparse` method should be called directly.
diff --git a/lib/rucio/transfertool/fts3.py b/lib/rucio/transfertool/fts3.py
index 83ebb2898..90f0ff462 100644
--- a/lib/rucio/transfertool/fts3.py
+++ b/lib/rucio/transfertool/fts3.py
@@ -508,7 +508,7 @@ class FTS3Transfertool(Transfertool):
     @staticmethod
     def __extract_host(external_host):
         # graphite does not like the dots in the FQDN
-        return urlparse.urlparse(external_host).hostname.replace('.', '_')
+        return urlparse(external_host).hostname.replace('.', '_')
 
     def __get_transfer_baseid_voname(self):
         """
['lib/rucio/transfertool/fts3.py']