[adoption_osp_deploy] Allow overriding scenario stack CLI args

[imatza-rh]

Summary

• Add cifmw_adoption_osp_deploy_stack_args_remove and cifmw_adoption_osp_deploy_stack_args_add variables to the adoption_osp_deploy role
• These allow callers to modify the TripleO overcloud deploy CLI arguments inherited from the DPA scenario file

Problem

TripleO CLI arguments like --libvirt-type generate internal heat environments that are applied after all user-provided -e files. This means cifmw_adoption_osp_deploy_overcloud_extra_args (which creates internal-configuration.yaml as the last -e file) cannot override them.

For shiftstack adoption jobs, we need --libvirt-type kvm instead of --libvirt-type qemu (nested virt requires KVM), but the existing override mechanism has no effect.

Solution

Use Ansible's difference filter to remove unwanted args and append replacements:

# In Zuul job vars:
cifmw_adoption_osp_deploy_stack_args_remove:
  - '--libvirt-type qemu'
cifmw_adoption_osp_deploy_stack_args_add:
  - '--libvirt-type kvm'

The defaults are empty lists, so this is fully backwards compatible.

Test plan

• ci-framework-jobs MR will consume this via Depends-On
• Verify shiftstack adoption deploy-osp produces --libvirt-type kvm in the overcloud deploy command

[openshift-ci]

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