Fix client IP logging in Horizon VirtualHost

The VirtualHost CustomLog directive was using a custom format that
only logged forwarded requests, missing direct requests entirely.

Replace with SetEnvIf and dual CustomLog lines to match the
nova-operator pattern, logging both direct and forwarded requests
with the correct client IP.

Closes: OSPRH-32110

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Francesco Pantano <fpantano@redhat.com>

Author: fmount

templates/horizon/config/httpd.conf

@@ -51,7 +51,9 @@ LogLevel debug
   ## Logging
   ErrorLog {{ .LogFile }}
   ServerSignature Off
-  CustomLog {{ .LogFile }} "%a %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" env=forwarded
+  SetEnvIf X-Forwarded-For "^.*\..*\..*\..*" forwarded
+  CustomLog {{ .LogFile }} combined env=!forwarded
+  CustomLog {{ .LogFile }} proxy env=forwarded
 
   ## RedirectMatch rules
   RedirectMatch permanent  ^/$ "{{ .horizonEndpoint }}/dashboard"