Description of problem:
The recently-added EC2MetadataIp has no default value. This means that you can't launch a stack by simply including the network-isolation.yaml and net-single-nic-with-vlans.yaml, you need a network environment file.

Version-Release number of selected component (if applicable):
openstack-tripleo-heat-templates.noarch    0.8.6-70.el7ost        @rhelosp-7.0-director-puddle


How reproducible:
100%

Steps to Reproduce:
1. Deploy with "openstack overcloud deploy -e /usr/share/openstack-tripleo-heat-templates/environments/network-isolation.yaml -e /usr/share/openstack-tripleo-heat-templates/environments/net-single-nic-with-vlans.yaml <other_params>
2.
3.

Actual results:
Stack failed with status: Resource CREATE failed: resources[0]: resources.Compute.Property error: resources.NetworkConfig.properties: Property ControlPlaneDefaultRoute not assigned


Expected results:
We used to have defaults defined for all values that worked well for CI and testing. Now, we can't deploy with default values unless there is a network-environment.yaml file. We either need a default network-environment.yaml inside of the environments folder, or we need to have defaults for these new parameters.

Additional info: