Install docker-engine from official Docker Inc's repository

Based on Krast76's role

At the moment roles is tested only on CentOS 7 and Debian 8

Available variables are listed below, along with default values (see defaults/main.yml)

• Package type (Community or Enterprise)

  docker_package_type: docker-ce

• Repository's GPG signature key (required for installation on Debian)

  docker_gpg_url: "https://download.docker.com/linux/debian/gpg"

• Docker Machine related variables :

  docker_machine: False docker_machine_version: 0.10.0

• Docker Compose related variables :

  docker_compose: False docker_compose_version: 1.12.0

---
- hosts: localhost
  vars:
    - docker_package_type: docker-ce
    - docker_compose: True
  roles:
    - docker