Revert multi-image overcloud-dib config

This was accidentally included in the Rocky Linux Wallaby backport (without the accompanying code).

Author: markgoddard

etc/kayobe/overcloud-dib.yml

@@ -10,14 +10,6 @@
 # is False. This will change in a future release.
 #overcloud_dib_build_host_images:
 
-# List of overcloud host disk images to build. Each element is a dict defining
-# an image in a format accepted by the stackhpc.os-images role. Default is to
-# build an image named "deployment_image" configured with the overcloud_dib_*
-# variables defined below: {"name": "deployment_image", "elements": "{{
-# overcloud_dib_elements }}", "env": "{{ overcloud_dib_env_vars }}",
-# "packages": "{{ overcloud_dib_packages }}"}.
-#overcloud_dib_host_images:
-
 # DIB base OS element. Default is {{ os_distribution }}.
 #overcloud_dib_os_element:
 
@@ -53,19 +45,6 @@
 # List of DIB packages to install. Default is to install no extra packages.
 #overcloud_dib_packages:
 
-# List of default git repositories containing Diskimage Builder (DIB) elements.
-# See stackhpc.os-images role for usage. Default is empty.
-#overcloud_dib_git_elements_default:
-
-# List of additional git repositories containing Diskimage Builder (DIB)
-# elements. See stackhpc.os-images role for usage. Default is empty.
-#overcloud_dib_git_elements_extra:
-
-# List of git repositories containing Diskimage Builder (DIB) elements. See
-# stackhpc.os-images role for usage. Default is a combination of
-# overcloud_dib_git_elements_default and overcloud_dib_git_elements_extra.
-#overcloud_dib_git_elements:
-
 # Upper constraints file for installing packages in the virtual environment
 # used for building overcloud host disk images. Default is {{
 # pip_upper_constraints_file }}.