[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

functions-common

@@ -1114,6 +1114,12 @@ function is_ironic_enforce_scope {
     return 1
 }
 
+function is_ironic_sharded {
+    # todo(JayF): Support >1 shard with multiple n-cpu instances for each
+    is_service_enabled ironic && [[ "$IRONIC_SHARDS" == "1" ]] && return 0
+    return 1
+}
+
 
 # Package Functions
 # =================

lib/nova_plugins/hypervisor-ironic

@@ -53,6 +53,10 @@ function configure_nova_hypervisor {
         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