tasks: lxc_container_create: Check for 'lxc-info' failures and retry

If lxc-info command fails, it's best if we know it rather than ignoring
it as if nothing serious has happened. We expect the container to be
present at that point, so we should be able to retrieve its state
information. If lxc-info fails (perhaps the container hasn't been
fully created yet so we can't get its state) then we can simply retry
and fail if we can't recover in a reasonable amount of time.

Change-Id: Iefb03508138bc9dbafef8be9dc669c89cafc8916

tasks/lxc_container_create.yml

@@ -38,10 +38,12 @@
 
 - name: Check container state
   command: "lxc-info -n {{ inventory_hostname }} --state"
-  failed_when: false
   changed_when: false
   delegate_to: "{{ physical_host }}"
   register: _lxc_container_state
+  until: _lxc_container_state | success
+  retries: 3
+  delay: 5
 
 # Due to https://github.com/ansible/ansible-modules-extras/issues/2691
 # this uses the LXC CLI tools to ensure that we get logging.