docker: remove old versions

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

roles/container-engine/docker/tasks/main.yml

@@ -171,12 +171,6 @@
 - name: flush handlers so we can wait for docker to come up
   meta: flush_handlers
 
-- name: set fact for docker_version
-  command: "docker version -f '{{ '{{' }}.Client.Version{{ '}}' }}'"
-  register: installed_docker_version
-  changed_when: false
-  check_mode: false
-
 # Install each plugin using a looped include to make error handling in the included task simpler.
 - include_tasks: docker_plugin.yml
   loop: "{{ docker_plugins }}"