Initial commit of systemd unit file
Add systemd unit file sections
Merged changes from feature/81819596_csaturnino_create_dockerfile
Update ExecStart command
Use COREOS_PUBLIC_IPV4 as HOST_IP
Update etcd keys of DOCKER_REGISTRY_HOST and DOCKER_IMAGE_NAME
Use SRS configuration naming convention
Fix typo error and tested unit file
[Finishes #81819750]
Update etcd keys name
Merge branch 'feature/81819750_csaturnino_create_systemd_unit_file' into develop
[Delivers #81819750]