Try running `docker info` again if it fails

Docker sometimes fails to reply if it has just been started.

Change-Id: I5ae37b8f264437a9e49b09da459e604191f9ed3e
Story: 2006718
Task: 37089

ansible/roles/docker/tasks/main.yml

@@ -61,6 +61,9 @@
   command: "docker info"
   register: docker_info
   changed_when: False
+  until: docker_info is success
+  retries: 3
+  delay: 5
 
 - name: Fail when loopback-mode containers or images exist
   fail: