Add documentation to the GRUB manual that specifies the order netboot
clients use to select a GRUB configuration file.
Also explain that the feature is enabled by default but can be disabled
by setting the "feature_net_search_cfg" environment variable to "n" in
an embedded configuration file.
Signed-off-by: Robert Marshall <rmarshall@redhat.com>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>