Create systemd unit file

PIVOTAL_TRACKER_STORY_URL=https://www.pivotaltracker.com/story/show/81819750
PIVOTAL_TRACKER_STORY_TYPE=feature
PIVOTAL_TRACKER_STORY_ESTIMATE=2
PIVOTAL_TRACKER_STORY_OWNER=carlsaturnino
PIVOTAL_TRACKER_STORY_REQUESTER=kdecastro
PIVOTAL_TRACKER_STORY_LABELS=docker images, docker-register
@joshuarubin I just saw your update on the config section of the SRS template.

```
/zvelo/config/system/<system_name>/service/<docker_service_image_name>/host/<coreos_hostname>/*
/zvelo/config/system/<system_name>/service/<docker_service_image_name>/data/*
/zvelo/config/system/<system_name>/host/<coreos_hostname>/*
/zvelo/config/system/<system_name>/shared/*
/zvelo/config/host/<coreos_hostname>/*
/zvelo/config/shared/*
```