Merge branch 'fix/hostname-errs' into 'master'

Fix getting hostname for error messages about device servers config

See merge request !93

src/calng/CalibrationManager.py

@@ -1074,7 +1074,7 @@ class CalibrationManager(DeviceClientBase, Device):
         # need are in there, and obtain their API names.
         for host, req_names in hosts.items():
             # Retrieve hostname for nice error messages.
-            hostname = urlparse(self._server_hosts[name]).hostname
+            hostname = urlparse(host).hostname
 
             try:
                 reply = await to_asyncio_future(self._http_client.fetch(