Failing to spawn new instances after a fresh OpenStack 16.1 All-In-One default deployment

Issue

• When trying to spawn new instances after a fresh Red Hat OpenStack Platform (RHOSP) 16.1 All-In-One default deployment (Tech Preview), it fails and outputs an error message like the one below:

  $ openstack server list
  +--------------------------------------+----------+--------+----------+--------+--------+
  | ID                                   | Name     | Status | Networks | Image  | Flavor |
  +--------------------------------------+----------+--------+----------+--------+--------+
  | b046a5b9-9aac-4503-ad29-9b842c6159d9 | myserver | ERROR  |          | cirros | tiny   |
  +--------------------------------------+----------+--------+----------+--------+--------+
  
  $ openstack server show myserver -f value -c fault
  
  {'code': 500, 'created': '2020-10-30T15:07:40Z', 'message': 'Exceeded maximum number of retries. Exhausted all hosts available for retrying build 
  failures for instance b046a5b9-9aac-4503-ad29-9b842c6159d9.', 'details': 'Traceback (most recent call last):\n  File "/usr/lib/python3.6/site- 
  packages/nova/conductor/manager.py", line 651, in build_instances\n    raise 
  exception.MaxRetriesExceeded(reason=msg)\nnova.exception.MaxRetriesExceeded: Exceeded maximum number of retries. Exhausted all hosts 
  available for retrying build failures for instance b046a5b9-9aac-4503-ad29-9b842c6159d9.\n'}
  

• RHOSP 16.1 All-In-One is deployed as a Virtual Machine on top of a KVM host and the standalone_parameters.yaml file has the following parameter defined:

  [...]
  StandaloneExtraConfig:
      NovaComputeLibvirtType: qemu
  [...]