Ensure devstack does not try to delete a physical NIC

Part of ironic-inspector devstack plugins cleanup proceedure is to try
to delete the ironic-inspector network interface if it isn't the ovs
bridge. This means that if you configure devstack to point at a real
network interface it'll try to delete it and fail breaking devstack.

Change-Id: I4f18edcf86278cce787a5f33f3d9f2444d738f2c

devstack/plugin.sh

@@ -28,6 +28,7 @@ IRONIC_INSPECTOR_INTERNAL_IP=${IRONIC_INSPECTOR_INTERNAL_IP:-172.24.42.254}
 IRONIC_INSPECTOR_INTERNAL_SUBNET_SIZE=${IRONIC_INSPECTOR_INTERNAL_SUBNET_SIZE:-24}
 IRONIC_INSPECTOR_DHCP_RANGE=${IRONIC_INSPECTOR_DHCP_RANGE:-172.24.42.100,172.24.42.253}
 IRONIC_INSPECTOR_INTERFACE=${IRONIC_INSPECTOR_INTERFACE:-br-inspector}
+IRONIC_INSPECTOR_INTERFACE_PHYSICAL=$(trueorfalse False IRONIC_INSPECTOR_INTERFACE_PHYSICAL)
 IRONIC_INSPECTOR_INTERNAL_URI="http://$IRONIC_INSPECTOR_INTERNAL_IP:$IRONIC_INSPECTOR_PORT"
 IRONIC_INSPECTOR_INTERNAL_IP_WITH_NET="$IRONIC_INSPECTOR_INTERNAL_IP/$IRONIC_INSPECTOR_INTERNAL_SUBNET_SIZE"
 # Whether DevStack will be setup for bare metal or VMs
@@ -299,7 +300,7 @@ function cleanup_inspector {
     sudo iptables -F ironic-inspector | true
     sudo iptables -X ironic-inspector | true
 
-    if [[ $IRONIC_INSPECTOR_INTERFACE != $OVS_PHYSICAL_BRIDGE ]]; then
+    if [[ $IRONIC_INSPECTOR_INTERFACE != $OVS_PHYSICAL_BRIDGE && "$IRONIC_INSPECTOR_INTERFACE_PHYSICAL" == "False" ]]; then
         sudo ip link show $IRONIC_INSPECTOR_INTERFACE && sudo ip link delete $IRONIC_INSPECTOR_INTERFACE
     fi
     sudo ip link show brbm-inspector && sudo ip link delete brbm-inspector