Upgrade from 3.2.10 to 3.2.11.

<ChangeLog>

Upgrade urgency HIGH: Potentially critical bugs fixed.

AOF flush on SHUTDOWN did not cared to really write the AOF buffers
(not in the kernel but in the Redis process memory) to disk before exiting.
Calling SHUTDOWN during traffic resulted into not every operation to be
persisted on disk.

</ChangeLog>