Add data mapping for vlan network
Add data mapping for vlan network

This commit adds a data_mapping for external_interface
to the clan tenant network type hierarchy.

It is worth noting that this duplicates config
from the gre data_mappings (which perhaps indicates
this is not where it belongs)

CiscoSystems/openstack-installer--to-be-replaced-by-puppet_openstack_builder,phchoic/puppet_openstack_builder,phchoic/puppet_openstack_builder,CiscoSystems/openstack-installer--to-be-replaced-by-puppet_openstack_builder,michaeltchapman/puppet_openstack_builder,CiscoSystems/puppet_openstack_builder,phchoic/puppet_openstack_builder,CiscoSystems/puppet_openstack_builder--to-be-deleted,michaeltchapman/puppet_openstack_builder,CiscoSystems/openstack-installer--to-be-replaced-by-puppet_openstack_builder,michaeltchapman/puppet_openstack_builder,michaeltchapman/vagrant-consul,michaeltchapman/vagrant-consul,CiscoSystems/puppet_openstack_builder--to-be-deleted,CiscoSystems/puppet_openstack_builder,CiscoSystems/puppet_openstack_builder--to-be-deleted