Enable logging.conf & fluentd for neutron

This change introduce ability to use log_config_append parameter with
new FluentdHandler to send logs directly to Fluentd.

To save per binary log streams as it is in the default logging states generates
separate logging.conf files per service and use /etc/default/<service name>
to pass dedicated logging.conf to every service.

Change-Id: I2952c8c0abe76690114d3ac5d3815b992d48d1cb
Related-Prod: PROD-16324
diff --git a/metadata/service/support.yml b/metadata/service/support.yml
index 6ad7d01..cde8934 100644
--- a/metadata/service/support.yml
+++ b/metadata/service/support.yml
@@ -3,6 +3,8 @@
     _support:
       collectd:
         enabled: true
+      fluentd:
+        enabled: true
       heka:
         enabled: true
       sensu: