In some cases it is useful to use a user other than the default 'kolla'
to perform kolla ansible remote execution. Kolla is adding support for
this in the Rocky release, we should use it.
It is now possible to configure a different user via the
kolla_ansible_user and kolla_ansible_group variables.
Depends-On: https://review.openstack.org/581330
Change-Id: I280fb8f70eacd31fff0ae5671ddd6608cd02ae6e
Story: 2002914
Task: 22892
41740f9752