Reorder external_network to match Juno
Reorder external_network to match Juno

Reorder external_network to match the Juno install-guide. No functional
changes.

Change-Id: Ie41983f2f70a7edad42ad7c65ed22e838551d646

openstack/training-labs,dguitarbite/OpenStack-Labs,openstack/training-labs,dguitarbite/OpenStack-Labs,dguitarbite/OpenStack-Labs,openstack/training-labs