Update redis to 2.6.9

--[ Redis 2.6.9 ]

UPGRADE URGENCY: MODERATE if you use replication.

* [BUGFIX]   Changing master at runtime (SLAVEOF command) in presence of
             network problems, or in very rapid succession, could result
             in non-critical problems (GitHub Issue #828).
* [IMPROVED] CLINGET GETNAME and SETNAME to set and query connection names
             reported by CLIENT LIST. Very useful for debugging of
             problems.
* [IMPROVED] redis-cli is now able to transfer an RDB file from a remote
             server to a local file using the --rdb <filename> command
             line option.

--[ Redis 2.6.8 ]

UPGRADE URGENCY: MODERATE if you use Lua scripting. Otherwise LOW.

* [BUGFIX]   Multiple fixes for EVAL (issue #872).
* [BUGFIX]   Fix overflow in mstime() in redis-cli and benchmark.
* [BUGFIX]   Fix Linux / PPC64 behavior by correcting endianess detection.
* [BUGFIX]   Fix NetBSD build by defining _XOPEN_SOURCE appropriately.
* [BUGFIX]   Added missing license and copyright in a few places.
* [BUGFIX]   Better error reporting when fd event creation fails.