Add common logging with filebeat

This commit
1. Provides a playbook to install the filebeat agent on all
   undercloud/overcloud nodes
2. Provides another playbook that adds the browbeat uuid to the
   filebeat config file and starts filebeat during browbeat run
3. Corresponding changes in browbeat.py and browbeat/tools.py
   to run the playbook to insert custom browbeat uuid in the
   filebeat configuration.

Change-Id: Idd2efaf931f4ff581db715a04adef738f81d281c

conf/gnocchi-minimal.yaml

@@ -7,6 +7,7 @@ browbeat:
 ansible:
   hosts: ansible/hosts
   metadata_playbook: ansible/gather/stockpile.yml
+  logging_playbook: ansible/common_logging/browbeat_logging.yml
   ssh_config: ansible/ssh-config
 elasticsearch:
   enabled: false
@@ -28,6 +29,8 @@ grafana:
   port: 3000
   dashboards:
     - openstack-general-system-performance
+filebeat:
+  enabled: false
 rally:
   sleep_before: 5
   sleep_after: 5