fix dependancies for docker_compose module

roles/install_docker/tasks/main.yml

@@ -22,9 +22,17 @@
   retries: 3
   until: apt_result is succeeded
 
-- name: Install docker-compose
-  get_url:
-    url: https://github.com/docker/compose/releases/download/1.28.0/docker-compose-Linux-x86_64 
-    # TODO: replace by "...1.28.0/docker-compose-$(uname -s)-$(uname -m)"
-    dest: /usr/local/bin/docker-compose
-    mode: '0755'
+# Official methode for docker compose, redundant with pip
+#- name: Install docker-compose
+#  get_url:
+#    url: https://github.com/docker/compose/releases/download/1.28.0/docker-compose-Linux-x86_64 
+#    # TODO: replace by "...1.28.0/docker-compose-$(uname -s)-$(uname -m)"
+#    dest: /usr/local/bin/docker-compose
+#    mode: '0755'
+
+# Methode requiered by ansible docker_compose module
+- name: Install docker and docker-compose
+  pip:
+    name:
+      - docker
+      - docker-compose