When upgrading the container_tech option may be undefined. This change
adds defaults to the container_tech conditional following the patter we
use through the rest of the playbooks.
Closes-Bug: #1747628
Change-Id: I415116f92f164a36f4594f3d11d109e60f62a9bd
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>
6c50146670