Fix SSL fingerprint was not always checked

As reported by James Cook, we would not check the fingerprint of the SSL
server, as we were looking for the 'ssl' module in locals() rather than
globals(). Ooops!

Rather than using globals() though, I simply remove the by-now
superfluous check. We now rely on python2.6 and we unconditionally
import the SSL module in any case, so it needs to be there.

Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de>

offlineimap/imaplibutil.py

@@ -1,6 +1,6 @@
 # imaplib utilities
 # Copyright (C) 2002-2007 John Goerzen <jgoerzen@complete.org>
-#                    2010 Sebastian Spaeth <Sebastian@SSpaeth.de>
+#               2012-2012 Sebastian Spaeth <Sebastian@SSpaeth.de>
 #    This program is free software; you can redistribute it and/or modify
 #    it under the terms of the GNU General Public License as published by
 #    the Free Software Foundation; either version 2 of the License, or
@@ -143,8 +143,7 @@ class WrappedIMAP4_SSL(UsefulIMAPMixIn, IMAP4_SSL):
 
     def open(self, host=None, port=None):
         super(WrappedIMAP4_SSL, self).open(host, port)
-        if (self._fingerprint or not self.ca_certs) and\
-                'ssl' in locals(): # <--disable for python 2.5
+        if (self._fingerprint or not self.ca_certs):
             # compare fingerprints
             fingerprint = sha1(self.sock.getpeercert(True)).hexdigest()
             if fingerprint != self._fingerprint: