Enable Nova v3 API

The Nova v3 API will be disabled by default after 31164 goes through.
This change explicitly enables the v3 API in the nova config file

Change-Id: I8b4c64b4718fc96d7a928c6fa3a0e8716c7edba1
diff --git a/lib/nova b/lib/nova
index c38f50c..d5c5dbb 100644
--- a/lib/nova
+++ b/lib/nova
@@ -436,6 +436,7 @@
     iniset $NOVA_CONF DEFAULT libvirt_type "$LIBVIRT_TYPE"
     iniset $NOVA_CONF DEFAULT libvirt_cpu_mode "none"
     iniset $NOVA_CONF DEFAULT instance_name_template "${INSTANCE_NAME_PREFIX}%08x"
+    iniset $NOVA_CONF DEFAULT osapi_v3_enabled "True"
 
     if is_service_enabled n-api; then
         iniset $NOVA_CONF DEFAULT enabled_apis "$NOVA_ENABLED_APIS"