Sort logging config to prevent rewrite & restart

In practice, <% node.elasticsearch[:logging].each do |key, value| %> seems to have a non-deterministic order and thus Chef will trigger a restart of the ElasticSearch server every time the chef-client is run (10.18.2). We run on a 30-minute chef cycle and were seeing periodic restarts of the server every 30-120 minutes.

I've added a sort to the logging.yml.erb template to prevent this.

```
diff -u /var/lib/chef/usr/local/etc/elasticsearch/logging.yml.chef-20130221071355 /var/lib/chef/usr/local/etc/elasticsearch/logging.yml.chef-20130221075603
--- /var/lib/chef/usr/local/etc/elasticsearch/logging.yml.chef-20130221071355	2013-02-21 06:59:31.000000000 +0000
+++ /var/lib/chef/usr/local/etc/elasticsearch/logging.yml.chef-20130221075603	2013-02-21 07:43:55.000000000 +0000
@@ -2,8 +2,8 @@
 
 logger.index.search.slowlog: TRACE, index_search_slow_log_file
 logger.action: DEBUG
-logger.com.amazonaws: WARN
 logger.index.indexing.slowlog: TRACE, index_indexing_slow_log_file
+logger.com.amazonaws: WARN
 
 additivity:
   index.search.slowlog: false
```