Packstack uses the nova module from the OpenStack Puppet Modules project, the nova::compute::vmware class sets the vmware configuration directives in the nova configuration file:

nova_config {
    'DEFAULT/compute_driver':     value => $compute_driver;
    'VMWARE/host_ip':             value => $host_ip;
    'VMWARE/host_username':       value => $host_username;
    'VMWARE/host_password':       value => $host_password;
    'VMWARE/cluster_name':        value => $cluster_name;
    'VMWARE/api_retry_count' :    value => $api_retry_count;
    'VMWARE/maximum_objects' :    value => $maximum_objects;
    'VMWARE/task_poll_interval' : value => $task_poll_interval;
    'VMWARE/use_linked_clone':    value => $use_linked_clone;
  }


 

https://github.com/openstack/puppet-nova/blob/master/manifests/compute/vmware.pp#L65 (https://github.com/openstack/puppet-n...)

Here's how packstack uses it:

class { '::nova::compute::vmware':
  host_ip       => hiera('CONFIG_VCENTER_HOST'),
  host_username => hiera('CONFIG_VCENTER_USER'),
  host_password => hiera('CONFIG_VCENTER_PASSWORD'),
  cluster_name  => $nova_vcenter_cluster_name,
}
 

https://github.com/openstack/packstack/blob/master/packstack/puppet/templates/nova_compute_vmware.pp#L2 (https://github.com/openstack/packstac...)

Since packstack sets only the values above, the module uses it's default values:

  $api_retry_count = 5,
  $maximum_objects = 100,
  $task_poll_interval = 5.0,
  $use_linked_clone = true,
  $wsdl_location = undef,
  $compute_driver = 'vmwareapi.VMwareVCDriver'
 

I hope this helps