DIB: do not mention dhcp-all-interfaces explicitly

It's a dependency of the ironic-python-agent-ramdisk element, so
it will be included anyway.

Depends-On: https://review.opendev.org/684304
Change-Id: Id47b8ff78506a15045cf31a5f619649a0b3147ed

doc/source/admin/dib.rst

@@ -16,19 +16,17 @@ To build an image using diskimage-builder_, run:
 
     ironic-python-agent-builder <distribution, e.g. ubuntu>
 
-You can add other diskimage-builder_ elements via the ``-e`` flag. For example,
-dhcp-all-interfaces_ is required for automatic DHCP on some operating systems
-(e.g. CentOS 7):
+You can add other diskimage-builder_ elements via the ``-e`` flag:
 
 .. code-block:: shell
 
-    ironic-python-agent-builder -e dhcp-all-interfaces centos7
+    ironic-python-agent-builder -e <extra-element> centos7
 
 You can specify the base name of the target images:
 
 .. code-block:: shell
 
-    ironic-python-agent-builder -o my-ipa -e dhcp-all-interfaces centos7
+    ironic-python-agent-builder -o my-ipa centos7
 
 ... with diskimage-builder
 ~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -112,6 +110,5 @@ The *devuser* element allows creating a user at build time, for example:
   disk-image-create debian ironic-python-agent-ramdisk devuser
 
 .. _diskimage-builder: https://docs.openstack.org/diskimage-builder
-.. _dhcp-all-interfaces: https://docs.openstack.org/diskimage-builder/latest/elements/dhcp-all-interfaces/README.html
 .. _dynamic-login: https://docs.openstack.org/diskimage-builder/latest/elements/dynamic-login/README.html
 .. _devuser: https://docs.openstack.org/diskimage-builder/latest/elements/devuser/README.html

roles/ipa-build-dib-image/tasks/main.yaml

@@ -4,7 +4,7 @@
 
 - name: Build a DIB image
   command: |
-    ironic-python-agent-builder -e dhcp-all-interfaces -o {{ image_name }} {{ image_distro }}
+    ironic-python-agent-builder -o {{ image_name }} {{ image_distro }}
   environment:
     # Use repositories checked out by Zuul
     DIB_REPOLOCATION_ironic_python_agent: '{{ ipa_source_path }}'