Handle appendfsync option

Change-Id: I7fa7f8baa82c34339e17c462a1a99006bc006213
diff --git a/redis/files/3.0/redis.conf b/redis/files/3.0/redis.conf
index 1fd36a0..fff790a 100644
--- a/redis/files/3.0/redis.conf
+++ b/redis/files/3.0/redis.conf
@@ -554,9 +554,7 @@
 #
 # If unsure, use "everysec".
 
-# appendfsync always
-appendfsync everysec
-# appendfsync no
+appendfsync {{ server.appendfsync|default('everysec') }}
 
 # When the AOF fsync policy is set to always or everysec, and a background
 # saving process (a background save or AOF log background rewriting) is