Only add internal_api_virtual_ip if InternalApi is in network_data
Only add internal_api_virtual_ip if InternalApi is in network_data

Add's a conditional to only include internal_api_virtual_ipi
if InternalApi network is defined in custom networks.

Closes-Bug: 1772124
Change-Id: I332355dc63c414aa411b3c1e09dc950b54d5d175

openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,openstack/tripleo-heat-templates,dprince/tripleo-heat-templates