Add two more logstash gearman workers.

Add logstash-worker4 and logstash-worker5.

Change-Id: Ibd1a618c4283b1d87904794d35963f69d1945b4e
Reviewed-on: https://review.openstack.org/33998
Reviewed-by: matthew wagoner <zxkuqyb@gmail.com>
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Approved: Clark Boylan <clark.boylan@gmail.com>
Tested-by: Jenkins
Better elasticsearch cluster settings.

Use mutliple discover nodes to determine elasticsearch cluster
membership. Put a timeout on recovery starting instead of the default
to recovery immediately. Describe cluster topology in elasticsearch yaml
config so that it can make smarter decisions. Round robin kibana
requests across each discover node.

Change-Id: I08ef9dd158ddf6a6ce01dfb2050626f543d45b10
Reviewed-on: https://review.openstack.org/34106
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Approved: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins