Add Redis replica recipe and role

roles/redis_replica.rb

@@ -0,0 +1,15 @@
+name "redis_replica"
+
+run_list %w(
+  kosmos_redis::replica
+  kosmos_redis::firewall
+)
+
+default_attributes({
+  'redisio' => {
+    'default_settings' => {
+      'slaveservestaledata' => 'yes',
+      'slavereadonly' => 'yes'
+    }
+  }
+})