Add ELK support

Elasticsearch, logstash and kibana modules added. The
ones from the forge are deeply flawed, new ones have been
written under github.com/michaeltchapman

Logstash-forwarder is used, and sample TLS certs provided.

Existing load balancing cluster is used to proxy ES for Kibana
users.

Change-Id: Ica300664b2c5b3c94f47a4b40c9be88adc5a7eae

Addresses aptira/puppet_openstack_builder#37