Configure Ironic iLO driver to use web server

Configuring iLO Ironic driver to use web server for hosting images.
This resolves an issue where it defaults to swift while running in
standalone mode, breaking virtual media provisioning.

(cherry picked from commit a192a75)

ironic-config/ironic.conf.j2

@@ -222,6 +222,7 @@ kernel_append_params = nofb nomodeset vga=normal ipa-insecure=1 {% if env.IRONIC
 
 [ilo]
 kernel_append_params = nofb nomodeset vga=normal ipa-insecure=1 {% if env.IRONIC_RAMDISK_SSH_KEY %}sshkey="{{ env.IRONIC_RAMDISK_SSH_KEY|trim }}"{% endif %} {{ env.IRONIC_KERNEL_PARAMS|trim }}
+use_web_server_for_images = true
 
 [irmc]
 kernel_append_params = nofb nomodeset vga=normal ipa-insecure=1 {% if env.IRONIC_RAMDISK_SSH_KEY %}sshkey="{{ env.IRONIC_RAMDISK_SSH_KEY|trim }}"{% endif %} {{ env.IRONIC_KERNEL_PARAMS|trim }}