Make it possible to do physical networks for VMs.

This patch makes it possible to setup physical networks for VMs,
separate to the control plane configuration which is needed for
routed/natted access to physical networks.

Future work is needed to automate ci-overcloud configuration of the
control plane where we need two distinct bridges, but this is enough
to stop folk dying of boredom setting up a sizeable ci-overcloud.

Change-Id: I6ac7129f22bb797467adb0408638781d20081f19

nova-compute-instance.yaml

@@ -29,6 +29,14 @@ Parameters:
     Description: If set, flat networks to configure in neutron plugins.
   NeutronHost:
     Type: String
+  NeutronPhysicalBridge:
+    Default: ''
+    Description: An OVS bridge to create for accessing external networks.
+    Type: String
+  NeutronPublicInterface:
+    Default: ''
+    Description: A port to add to the NeutronPhysicalBridge.
+    Type: String
   RabbitHost:
     Type: String
   RabbitPassword:
@@ -169,6 +177,8 @@ Resources:
           network_vlan_ranges: {Ref: NeutronNetworkVLANRanges}
           bridge_mappings: {Ref: NeutronBridgeMappings}
           enable_tunneling: {Ref: NeutronEnableTunnelling}
+          physical_bridge: {Ref: NeutronPhysicalBridge}
+          public_interface: {Ref: NeutronPublicInterface}
         service-password:
           Ref: NeutronPassword
       admin-password: {Ref: AdminPassword}

overcloud-source.yaml

@@ -81,6 +81,14 @@ Parameters:
     Type: String
     Default: ''
     Description: If set, flat networks to configure in neutron plugins.
+  HypervisorNeutronPhysicalBridge:
+    Default: ''
+    Description: An OVS bridge to create on each hypervisor.
+    Type: String
+  HypervisorNeutronPublicInterface:
+    Default: ''
+    Description: What interface to add to the HypervisorNeutronPhysicalBridge.
+    Type: String
   NeutronPublicInterface:
     Default: eth0
     Description: What interface to bridge onto br-ex for network nodes.
@@ -165,6 +173,10 @@ Resources:
         NeutronFlatNetworks:
             Ref: NeutronFlatNetworks
         NeutronNetworkVLANRanges: ""
+        NeutronPhysicalBridge:
+            Ref: HypervisorNeutronPhysicalBridge
+        NeutronPublicInterface:
+            Ref: HypervisorNeutronPublicInterface
         NeutronBridgeMappings:
             Ref: NeutronBridgeMappings
         RabbitPassword: "guest"