Update from 2.6.13 to 2.6.14.
UPGRADE URGENCY: HIGH because of the following two issues:
* Lua scripting + Replication + AOF in slaves problem (see Issue #1164).
* AOF + expires possible race condition (see Issue #1079).
* [FIX] AOF bug: expire could be removed from key on AOF rewrite.
* [FIX] Allow writes from scripts called by AOF loading in read-only slaves.
* [FIX] Sentinel: parse new verison of INFO replication output correctly.
* [NEW] Reset masterauth if an empty string is configured.