Sets DEFAULT_INSTANCE_TYPE in localrc for Ironic

Set DEFAULT_INSTANCE_TYPE=baremetal for Ironic so lib/tempest
pulls the correct flavor_ref during Tempest configuration.

Change-Id: Ie5c649c7d6dd145559d2ca7948e77bbdee4e6a37

devstack-vm-gate.sh

@@ -193,6 +193,7 @@ EOF
     if [ "$DEVSTACK_GATE_VIRT_DRIVER" == "ironic" ]; then
         echo "VIRT_DRIVER=ironic" >>localrc
         echo "IRONIC_BAREMETAL_BASIC_OPS=True" >>localrc
+        echo "DEFAULT_INSTANCE_TYPE=baremetal" >>localrc
     fi
 
     if [ "$DEVSTACK_GATE_TEMPEST" -eq "1" ]; then