fix which exception is thrown by not having IPv6 loopback

Signed-off-by: Matt Cipperly <[email protected]>

Author: mcipperly

tests/test_sender.py

@@ -296,7 +296,7 @@ def test_ipv6_only(self):
         # Test if our host supports IPv6 before running this test
         try:
             socket.gethostbyaddr('::1')
-        except socket.gaierror:
+        except socket.herror:
             self.skipTest("Host does not support IPv6, cannot run this test")
 
         self.tearDown()