upgrading docker version

roles/docker/tasks/install.yml

@@ -13,7 +13,7 @@
   with_items:
     - aufs-tools
     - cgroupfs-mount
-    - docker-engine=1.8.3-0~{{ ansible_distribution_release }}
+    - docker-engine=1.9.1-0~{{ ansible_distribution_release }}
 
 - name: Copy default docker configuration
   template: src=default-docker.j2 dest=/etc/default/docker backup=yes