Refactor the push-docker role

Signed-off-by: Clement Verna <cverna@tutanota.com>

roles/push-docker/tasks/main.yml

@@ -1,11 +1,11 @@
 ---
 # tasks file for push-docker
 #
-- name: install docker
-  action: "{{ ansible_pkg_mgr }} name=docker state=present"
-
-- name: install python-docker-py
-  package: name=python-docker state=present
+- name: install docker and python-docker
+  package: name="{{ item }}" state=present
+  with_items:
+    - docker
+    - python-docker
 
 - name: ensure docker daemon cert dir exists
   file: