Without this, when there are multiple admin networks (e.g. a VLAN)
Nova will refuse to guess and we'll fail to deploy.
Change-Id: Id1dca43ef287fda2adcfdf5b5d30145b055dbe76
         Ref: ImageUpdatePolicy
       flavor: {Ref: OvercloudComputeFlavor}
       key_name: {Ref: KeyName}
+      networks:
+        - network: ctlplane
       user_data_format: SOFTWARE_CONFIG
   NovaCompute0Deploy:
     DependsOn: [controller0Deployment]
 
         Ref: OvercloudControlFlavor
       key_name:
         Ref: KeyName
+      networks:
+        - network: ctlplane
       user_data_format: SOFTWARE_CONFIG
   controller0AllNodesConfig:
     Type: OS::Heat::StructuredDeployment
 
         Ref: KeyName
       image_update_policy:
         Ref: ImageUpdatePolicy
+      networks:
+        - network: ctlplane
       user_data_format: SOFTWARE_CONFIG
   99_undercloudDeployment:
     Type: OS::Heat::StructuredDeployment