Bug#756540: [PATCH] catching error from non-imported module

commit 1dbc8ce4 added more error handling around smtp connections but
forgot to import the module "socket" to be able to catch exceptions
defined in that module.

monkeysign/ui.py

@@ -37,6 +37,7 @@ import sys
 import re
 import os
 import shutil
+import socket
 
 class MonkeysignUi(object):
     """User interface abstraction for monkeysign.