1. Proposed title of this feature request

Allow openshift-install tool to create `install-config.yaml` for none or
baremetal or either both like,

~~~~
$openshift-install create install-config
? Platform  [Use arrows to move, type to filter, ? for more help]
> alibabacloud
  aws
  azure
  gcp
  ibmcloud
  nutanix
  openstack
  baremetal   <<-------- This
  None            <<-------- This
~~~~~

and same thing can be taken for Agent Based install-configs

~~~~~
$openshift-install agent create install-config
? Platform  [Use arrows to move, type to filter, ? for more help]
> alibabacloud
  aws
  azure
  gcp
  ibmcloud
  nutanix
  openstack
  baremetal
  None
~~~~

Expectations would be asking minimal things like cluster-name/machinenetwork
and VIP's , ssh key and pull secret.

2. What is the nature and description of the request?
Adding something more to existing tool to enhance our tool capability.

3. Why does the customer need this? (List the business requirements here)

There are multiple times when customer do not have access to the documentation
or it creates clearical job to copy paste the samples from documentation and
build it with own hands adding a lot of mistakes to that yaml indentation!

An average user never raise a case as the wrong indentation in yaml sometimes
causes issues to create ignitions and ISO in case of ABI install but this
portion to settle the yaml things eats most of the time of support people as
well.

Having something like this available would save up time even when we need to
generate the new/fresh install-config with just few hits of keyboard buttons.

This is already available for cloud and integrated platforms it's just none
and baremetal are leftouts.  Also "openshift-install agent create
agent-config-template" is already available.

4. List any affected packages or components.
Openshift-install