bifrost: Retain default value of true for enable_inspector_discovery

In the Wallaby cycle, Bifrost changed the default value of
enable_inspector_discovery from true to false. To maintain backwards
compatibility, we override the setting to true.

Depends-On: https://review.opendev.org/762998/
Change-Id: Ie504fe9e7934e3e9f399d010cd8c5e242a152bb7

ansible/roles/kolla-bifrost/templates/bifrost.yml.j2

@@ -70,6 +70,9 @@ firewalld_internal_zone: "{{ kolla_bifrost_firewalld_internal_zone }}"
 # Disable authentication for the Ironic and Inspector APIs.
 noauth_mode: true
 
+# Enable discovery of nodes in Ironic Inspector.
+enable_inspector_discovery: true
+
 {% if kolla_bifrost_extra_globals %}
 ###############################################################################
 # Extra configuration