Feature - zookeeper runs in ha mode

following steps were performed:
 - Add ansible scripts to run zookeeper container
 - Disable ipv6 on coreos
 - zookeeper docker is starting with --net=host
 - Add dummy ansible roles for other containers
Fix - Ensure that zookeeper starts on proper server

- Gather info about coreos hosts ips and ids
- Ensure that zookeeper instances starts accoarding to what will be
defined in zoo.cfg file
Merge branch 'feature/zookeeper_ha' into develop
Add - script to return all current zookeeper nodes

 - get_zookeeper_endpoints.sh returns connection info about zookeeper
 servers registered in etcd
Add - added module to get coreos machines info

- more modules might need info about coreos machines therefore I've
created simple bash/awsk based get_coreos_machines module
Merge branch 'feature/zookeeper_ha' into develop
Adding registry units and ansible playbook
Added documentation
Merge branch 'feature/docker_registry' into develop
Add docker registry

- registry and zookeeper are deployed using ansible