Fixed the upgrade script edge case
Fixed the upgrade script edge case

Changed the command to find the containers to only look for the contianer
config file within a given directory and to only look one level deep.
This change is in response to an issue that can happen if the container
directory "/var/lib/lxc" is also a mounted file system.

Change-Id: Id39995580900e2b9d9a35435d0cfeba82075d62b
Closes-Bug: #1470571
(cherry picked from commit 3e0e848181b4fe4ace48d773f3113ef111227519)

yanyao/openstack-deployment,yanyao/openstack-deployment,yanyao/openstack-deployment,VaneCloud/openstack-ansible,VaneCloud/openstack-ansible,VaneCloud/openstack-ansible,yanyao/openstack-deployment