Cope with the Netgear switch not asking about saving changes

At disconnect, it may ask or not. Cope either way - deal with
pexpect.EOF() and exit cleanly if needed.

Change-Id: I7fe7a8c807ace00cfb7bfc108a9d4b1bfd7ebcde
diff --git a/drivers/NetgearXSM.py b/drivers/NetgearXSM.py
index de12eaf..1281cbc 100644
--- a/drivers/NetgearXSM.py
+++ b/drivers/NetgearXSM.py
@@ -527,8 +527,11 @@
     def _logout(self):
         logging.debug("Logging out")
         self._cli("quit", False)
-        self.connection.expect("Would you like to save them now")
-        self._cli("n")
+        try:
+            self.connection.expect("Would you like to save them now")
+            self._cli("n")
+        except (pexpect.EOF):
+            pass
 
     def _configure(self):
         self._cli("configure")