Enable logging.conf & fluentd for glance

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: Ie592faf9c91c71d5cc551bac62b25a19f04eb691
Related-Prod: PROD-16324
9 files changed