Set service_type in [keystone_authtoken] for access rule validation

Without service_type configured, keystonemiddleware cannot validate
application credentials with custom access rules, causing HTTP 401
for end users.

Closes: OSPRH-22365

Signed-off-by: Veronika Fisarova <vfisarov@redhat.com>

Author: Deydra71

templates/barbican/config/00-default.conf

@@ -27,6 +27,7 @@ project_name=service
 project_domain_name=Default
 {{- end }}
 interface = internal
+service_type = key-manager
 {{ if (index . "Region") -}}
 region_name = {{ .Region }}
 {{ end -}}