[nova] nanny fails reading the nova config

[artherd42]

After Nova was upgraded to Xena release the nova-nanny fails when reading the nova configuration. Either with error 2023-05-23 06:56:54,498 ERROR: Check Nova configuration file. or with sed: can't read /etc/nova/nova.conf.d/db.conf: No such file or directory

[grandchild]

This was my error when updating in secrets, I didn't add the new_config variable.
Fixed now.