Add host metadata to core beats output

This change adds fields such as host OS, version and platform to the
core beats output, giving extra query/filter capabilities.

Change-Id: Iff61bb4402eaa45b8f1c134a6a39cebe6613cbf3

elk_metrics_6x/roles/elastic_auditbeat/templates/auditbeat.yml.j2

@@ -244,7 +244,8 @@ auditbeat.modules:
 #
 #processors:
 #- add_docker_metadata: ~
-#- add_host_metadata: ~
+processors:
+- add_host_metadata: ~
 
 #============================= Elastic Cloud ==================================
 

elk_metrics_6x/roles/elastic_filebeat/templates/filebeat.yml.j2

@@ -1420,6 +1420,8 @@ tags:
 #
 #processors:
 #- add_docker_metadata: ~
+processors:
+- add_host_metadata: ~
 
 #============================= Elastic Cloud ==================================
 

elk_metrics_6x/roles/elastic_heartbeat/templates/heartbeat.yml.j2

@@ -356,6 +356,8 @@ heartbeat.scheduler:
 #
 #processors:
 #- add_docker_metadata: ~
+processors:
+- add_host_metadata: ~
 
 #============================= Elastic Cloud ==================================
 

elk_metrics_6x/roles/elastic_metricbeat/templates/metricbeat.yml.j2

@@ -665,6 +665,9 @@ metricbeat.modules:
 ##processors:
 ##- add_docker_metadata: ~
 #
+processors:
+- add_host_metadata: ~
+
 ##============================= Elastic Cloud ==================================
 #
 ## These settings simplify using metricbeat with the Elastic Cloud (https://cloud.elastic.co/).

elk_metrics_6x/roles/elastic_packetbeat/templates/packetbeat.yml.j2

@@ -634,6 +634,8 @@ packetbeat.protocols:
 #
 #processors:
 #- add_docker_metadata: ~
+processors:
+- add_host_metadata: ~
 
 #============================= Elastic Cloud ==================================