Add host IP to etcd during zookeeper startup
Add env variable giving zookeeper entrypath

 - Add bash file which runs on mesos-*, marathon start and returns
   zookeeper IP:PORT
    - should return multiple ports in future
 - Updated unit files to leverage ZOOKEEPER_ENDPOINTS env var
 - Updated Dockerfiles to leverage ZOOKEEPER_ENDPOINTS env var
 - Added ansible script to create script on each coreos node
Cleanup
Merge branch 'feature/dynamic_zookeeper' into develop
First release

 - Currently only one service of each is running