Parametrize ironic api microversion

Introduce _param:openstack_baremetal_simulator_api_microversion 1.33 by
default. The param specify ironic API request microversion
that will be done by default.

Change-Id: I698004a13ded15591392939012f697c1dd3b854e
diff --git a/metadata/service/nodes_flat.yml b/metadata/service/nodes_flat.yml
index 9ede4c3..bcfb989 100644
--- a/metadata/service/nodes_flat.yml
+++ b/metadata/service/nodes_flat.yml
@@ -3,6 +3,7 @@
 parameters:
   _param:
     openstack_baremetal_simulator_mac_vendor: "aa:bb:cc"
+    openstack_baremetal_simulator_api_microversion: '1.33'
   ironic:
     client:
       enabled: true
@@ -10,7 +11,7 @@
         admin_identity:
           - name: ${linux:network:hostname}-n0
             driver: pxe_ipmitool
-            microversion: '1.33'
+            microversion: ${_param:openstack_baremetal_simulator_api_microversion}
             properties:
               local_gb: 10
               cpus: 1
@@ -34,7 +35,7 @@
                 volume_type: iqn
           - name: ${linux:network:hostname}-n1
             driver: pxe_ipmitool
-            microversion: '1.33'
+            microversion: ${_param:openstack_baremetal_simulator_api_microversion}
             properties:
               local_gb: 10
               cpus: 1
@@ -62,7 +63,7 @@
                 volume_type: iqn
           - name: ${linux:network:hostname}-n2
             driver: pxe_ipmitool
-            microversion: '1.33'
+            microversion: ${_param:openstack_baremetal_simulator_api_microversion}
             properties:
               local_gb: 10
               cpus: 1