Add dcn_storage scenario for DCN adoption with Ceph HCI

[fultonj]

Add VM layout for DCN deployment with 3 Ceph clusters.

Changes from dcn_nostorage:

• Increase extra_disks_size from 15G to 30G for Ceph OSDs
• All 9 compute nodes (central, dcn1, dcn2) configured for HCI
• Stack name is passed to adoption ceph playbook
• Fix os-net-config to use stack-specific ctlplane network (ctlplanedcn1/ctlplanedcn2) instead of hardcoded 'ctlplane'
• Fix tripleo-ansible-inventory template computes group condition to match DCN group names like 'osp-dcn1-compute-az1s' which contain 'compute' but not 'computes'
• Add adoption_dcn_export.yml playbook to export central stack for DCN site deployments
• Add adoption_dcn_update_central.yml playbook to update central glance to use ceph at the DCN sites.

This scenario pairs with data-plane-adoption's dcn_storage.yaml to deploy OSP 17.1 with Ceph at central and edge sites.

Related: openstack-k8s-operators/data-plane-adoption#1245

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