[Devstack] Update the flavor resource parameter

As the client changed to use resources from resource, need to update
the parameter in devstack to make the gate happy.

Change-Id: I610b3f242863ac453c139c2762a9f9af03f0f4eb
Depends-On: I6d41d02b5ec1881d662a578a1380a223a27df055

devstack/plugin.sh

@@ -198,7 +198,7 @@ function create_flavor {
     fi
     name="baremetal_${ironic_node_cpu}cpu_${ironic_node_ram}mbram_${ironic_node_disk}gbdisk"
     description="CPU: ${ironic_node_cpu}, RAM: ${ironic_node_ram}MB, DISK: ${ironic_node_disk}GB"
-    openstack baremetalcompute flavor create ${name} --description "${description}" --resources $IRONIC_DEFAULT_RESOURCE_CLASS=1
+    openstack baremetalcompute flavor create ${name} --description "${description}" --resource $IRONIC_DEFAULT_RESOURCE_CLASS=1
 }