Sort log format fields alphabetically

Author: zacblazic

config/log.conf

@@ -8,8 +8,8 @@ log_format main_json escape=json
     '"body_bytes_sent":"$body_bytes_sent",'
     '"host":"$host",'
     '"http_connection":"$http_connection",'
-    '"http_upgrade":"$http_upgrade",'
     '"http_referer":"$http_referer",'
+    '"http_upgrade":"$http_upgrade",'
     '"http_user_agent":"$http_user_agent",'
     '"http_x_amzn_trace_id":"$http_x_amzn_trace_id",'
     '"http_x_forwarded_for":"$http_x_forwarded_for",'