1. Proposed title of this feature request

With this request I'm proposing a feature request that shall allow doing
minimal changes to the configurations done with either install configs or
agent-configs.

Ex: User entered a wrong disk name in agent-config. 

The error is printed as,

Installation cannot proceed:
master0: Failed to update host installation disk to /dev/not-found-by-hints (from /dev/disk/by-path/pci-xyza:11:00.0-ata-1.0): Requested installation disk is not part of the host's valid disks.
Here what user did is added  following config to agent-config.yaml

macAddress: 00:00:6A:BA:16:82
rootDeviceHints:
deviceName: "/dev/disk/by-path/pci-xyza:11:00.0-ata-1"
 

So it's a clear typo but the error log shows the correct disk name it has
found to user.

To correct this he/she/they have to correct configs and re-generate the ISO to
install, this eats time for a user by adding recurring work.

Instead, if user can see what error is and what needs to be corrected he shall
have a option to do the runtime change. 

We already have similar validator for networking on ABI install 4.13+
release.

This can happen for many thing but I'd expect if we are able to have the
pre-install validations checked and corrected before turning to failed install
with a option to have runtime changes then it shall save million of minutes
considering a lot if customers are using it nowadays.

2. What is the nature and description of the request?

Completely new feature.

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

It's going to save time a user takes to correct config and generate ISO and then add it to nodes again till the installation check fails.
Every customer using ABI installation would be benefited from this.

The Assisted Installer already has this as we can select the disk with GUI.

4. List any affected packages or components.
Agent Based installer