examples: guestbook-go: fix the redis-master version

The guestbook-go example is broken because the latest tag of redis has moved to redis 3.0 which speaks a new protocol. This means that the slaves, which have fixed 2.0 versions, will error out on the protocol: ``` [7] 15 May 23:37:44.403 # Can't handle RDB format version 7 [7] 15 May 23:37:44.403 # Failed trying to load the MASTER synchronization DB from disk [7] 15 May 23:37:45.333 * Connecting to MASTER redis-master:6379 [7] 15 May 23:37:45.427 * MASTER <-> SLAVE sync started ``` In this case the app simply never persists data. cc @luebken @Gurpartap

examples: guestbook-go: fix the redis-master version
ff5a2a75 · Brandon Philips · aada051b · ff5a2a75
Commit ff5a2a75 authored May 15, 2016 by Brandon Philips
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redis-master-controller.json examples/guestbook-go/redis-master-controller.json +1 -1

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--- a/examples/guestbook-go/redis-master-controller.json
+++ b/examples/guestbook-go/redis-master-controller.json
@@ -25,7 +25,7 @@
            "containers":[
               {
                  "name":"redis-master",
-                  "image":"redis",
+                  "image":"redis:2.8.23",
                  "ports":[
                     {
                        "name":"redis-server",