Compute node replacement fails and one of our nodes is blacklisted

Issue

• A compute node was deleted with " openstack overcloud node delete" command in order to get it replaced by a new one
• The new node is failing to deploy
• /etc/os-net-config/config.json on the deployment node has no ip addresses

          "type": "vlan",
          "addresses": [
            {
              "ip_netmask": "/24"
            }
          ],
          "vlan_id": 11

ip_netmask should be something like 192.168.1.X/24

• There is a blacklisted node index:

openstack stack show overcloud | grep -i RemovalPolicies
|                       | BlockStorageRemovalPolicies: '[]'                                                                                                                                                                                                                                                      |
|                       | CephStorageRemovalPolicies: '[]'                                                                                                                                                                                                                                                       |
|                       | ComputeT2RemovalPolicies: '[{u''resource_list'': [u''4'']}]'    << inde 4 blacklisted                                                                                                                                                                                                     |
|                       | ComputeRemovalPolicies: '[]'                                                                                                                                                                                                                                                         |
                                                                                                                                                                                                                    |
|                       | ControllerRemovalPolicies: '[]'                                                                                                                                                                                                                                                        |
|                       | ObjectStorageRemovalPolicies: '[]'                                                                                                                                                                                                                                                     | 

• The blacklisted node index correspond to the node being deployed
• There are no more IP's available on allocation pools

  ComputeT2:
    internal_api:
      - 192.168.1.12
      - 192.168.1.13
      - 192.168.1.14
      - 192.168.1.15
      - 192.168.1.16  >> blacklisted node index 4 

HostnameMapping is being used and node, in this case, node:compute-4 :

#openstack baremetal node show 112255c8-1111-4z51-af08-d2e45111111d
...
| properties             | {u'cpu_arch': u'x86_64', u'root_device': {u'wwn': u'0x6107d1111bf64500'}, u'cpus': u'56', u'capabilities': u'node:compute-4,boot_option:local', u'memory_mb': u'262144', u'local_gb':  |
...