Deploying Red Hat OpenStack Platform with networks only but fails on internalAPI

Issue

Deploying Red Hat OpenStack platform controller with just two networks:
- Internal (combining ctlplane, internalapi, storage, storage_management and tenant)
- External (this will be used for public API endpoints ONLY and maybe for neutron router uplinks)

Deployment fails as internalAPI was not set.

2019-04-11 21:41:03Z [hostsConfig]: CREATE_COMPLETE  Stack CREATE completed successfully
2019-04-11 21:41:03Z [SshKnownHostsConfig.SSHKnownHostsConfig]: CREATE_COMPLETE  state changed
2019-04-11 21:41:03Z [ControllerIpListMap.EnabledServicesValue]: CREATE_IN_PROGRESS  state changed
2019-04-11 21:41:03Z [SshKnownHostsConfig]: CREATE_COMPLETE  Stack CREATE completed successfully
2019-04-11 21:41:03Z [ControllerIpListMap.EnabledServicesValue]: CREATE_COMPLETE  state changed
2019-04-11 21:41:03Z [hostsConfig]: CREATE_COMPLETE  state changed
2019-04-11 21:41:04Z [ControllerAllNodesValidationConfig]: CREATE_COMPLETE  state changed
2019-04-11 21:41:04Z [SshKnownHostsConfig]: CREATE_COMPLETE  state changed
2019-04-11 21:41:04Z [ControllerHostsDeployment]: CREATE_IN_PROGRESS  state changed
2019-04-11 21:41:04Z [ControllerIpListMap.NetIpMapValue]: CREATE_IN_PROGRESS  state changed
2019-04-11 21:41:04Z [ControllerIpListMap.NetIpMapValue]: CREATE_COMPLETE  state changed
2019-04-11 21:41:04Z [ControllerIpListMap]: CREATE_COMPLETE  Stack CREATE completed successfully
2019-04-11 21:41:04Z [ControllerSshKnownHostsDeployment]: CREATE_IN_PROGRESS  state changed
2019-04-11 21:41:05Z [ControllerHostsDeployment]: CREATE_IN_PROGRESS  Stack CREATE started
2019-04-11 21:41:05Z [ControllerSshKnownHostsDeployment]: CREATE_IN_PROGRESS  Stack CREATE started
2019-04-11 21:41:05Z [ControllerIpListMap]: CREATE_COMPLETE  state changed
2019-04-11 21:41:05Z [ControllerHostsDeployment.0]: CREATE_IN_PROGRESS  state changed
2019-04-11 21:41:05Z [ControllerSshKnownHostsDeployment.0]: CREATE_IN_PROGRESS  state changed
2019-04-11 21:41:06Z [allNodesConfig]: CREATE_IN_PROGRESS  state changed
2019-04-11 21:41:07Z [allNodesConfig]: CREATE_FAILED  resources.allNodesConfig: Property error: resources.allNodesConfigImpl.properties.config: The Parameter (InternalApiNetName) was not provided.
2019-04-11 21:41:07Z [overcloud]: UPDATE_FAILED  Resource CREATE failed: resources.allNodesConfig: Property error: resources.allNodesConfigImpl.properties.config: The Parameter (InternalApiNetName) was not provided.

 Stack overcloud UPDATE_FAILED


overcloud.allNodesConfig:
  resource_type: OS::TripleO::AllNodes::SoftwareConfig
  physical_resource_id:
  status: CREATE_FAILED
  status_reason: |
    resources.allNodesConfig: Property error: resources.allNodesConfigImpl.properties.config: The Parameter (InternalApiNetName) was not provided.
Heat Stack update failed.
Heat Stack update failed