[nova][ironic] Support configuring 1 shard on n-cpu

Allows for testing of basic sharding configuration.

Change-Id: Idfb2bd1822898d95af8643d69d97d9a76b4d64cc
Needed-By: https://review.opendev.org/c/openstack/ironic/+/894460
diff --git a/lib/nova_plugins/hypervisor-ironic b/lib/nova_plugins/hypervisor-ironic
index f058e9b..9a39c79 100644
--- a/lib/nova_plugins/hypervisor-ironic
+++ b/lib/nova_plugins/hypervisor-ironic
@@ -53,6 +53,10 @@
         iniset $NOVA_CONF ironic project_domain_id default
         iniset $NOVA_CONF ironic project_name demo
     fi
+    if is_ironic_sharded; then
+        iniset $NOVA_CONF ironic shard $IRONIC_SHARD_1_NAME
+    fi
+
     iniset $NOVA_CONF ironic user_domain_id default
     iniset $NOVA_CONF ironic region_name $REGION_NAME