same as from BZ1630968 comment 2:

~~~
1629912 introduced my_ip to nova/manifests/init.pp which is required to fix  1552855 as a result we now have the dupe in openstack-puppet-modules:

 nova_config {
   'DEFAULT/my_ip':                     value => $ipaddress;
   'DEFAULT/linuxnet_interface_driver': value => 'nova.network.linux_net.LinuxOVSInterfaceDriver';
   'DEFAULT/rpc_response_timeout':      value => '600';
   'DEFAULT/sync_power_state_interval': value => hiera('nova_sync_power_state_interval');

I'll submit a patch to instack-undercloud to use the new my_ip from openstack-puppet-modules for OSP8/9 instead of the current nova_config.
~~~

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:2848