This commit adds the necessary changes needed to support
reading and writing Kolla passwords to a Hashicorp Vault server
using Kolla-Ansible commands `kolla-readpwd` and `kolla-writepwd`.

This follows the support that was added into Kolla-Ansible in
the Change-Id Icf0eaf7544fcbdf7b83f697cc711446f47118a4d.

Change-Id: I732988e6160cc64d663d6ef8179f04d3e1226537