python.ovs.db.idl: Fix Row.delete() of a row already committed to the db.

Row.delete() handled the case of deleting a row that was added within the
current transaction, but not yet committed, but it did not correctly handle
the case of deleting a row that belonged to the database before the
transaction started.  This fixes the problem.

Reported-by: Yeming Zhao <zhaoyeming@gmail.com>
Tested-by: Yeming Zhao <zhaoyeming@gmail.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>

AUTHORS

@@ -197,6 +197,7 @@ Vishal Swarankar        vishal.swarnkar@gmail.com
 Vjekoslav Brajkovic     balkan@cs.washington.edu
 Voravit T.              voravit@kth.se
 YAMAMOTO Takashi        yamamoto@valinux.co.jp
+Yeming Zhao             zhaoyeming@gmail.com
 Yongqiang Liu           liuyq7809@gmail.com
 kk yap                  yapkke@stanford.edu
 likunyun                kunyunli@hotmail.com

python/ovs/db/idl.py

@@ -1,4 +1,4 @@
-# Copyright (c) 2009, 2010, 2011, 2012 Nicira, Inc.
+# Copyright (c) 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -610,6 +610,8 @@ class Row(object):
         assert self._changes is not None
         if self._data is None:
             del self._idl.txn._txn_rows[self.uuid]
+        else:
+            self._idl.txn._txn_rows[self.uuid] = self
         self.__dict__["_changes"] = None
         del self._table.rows[self.uuid]