Document the keyfile option to decrypt the passwords.yml

[OpenStack Infra]

https://review.openstack.org/271184
Dear bug triager. This bug was created since a commit was marked with DOCIMPACT.
Your project "openstack/kolla" is set up so that we directly report the documentation bugs against it. If this needs changing, the docimpact-group option needs to be added for the project. You can ask the OpenStack infra team (#openstack-infra on freenode) for help if you need to.

commit 0f01d3ebc7c96265c1a8f304ad72ed5e773b2178
Author: Allen Gao <email address hidden>
Date: Wed Jan 20 22:02:20 2016 +0800

    Add the keyfile option to decrypt the passwords.yml

    The passed keyfile path is used to decrypt the passwords.yml
    which encrypted by the ansible vault.

    Partially-Implements: blueprint encrypt-sensitive-info
    DocImpact
    Change-Id: Ifaebf464478cde99e896c13b375cfaf9282ee576

[Prithiv (prithiv)]

sdake, any update on this ?

[Steven Dake (sdake)]

Prithiv,

Not sure what update you would want from me - I didn't add the feature so I don't know how to document it ;) Your the assignee, if you can look at the patch in the mentioned commit and write documentation for master, it would be much appreciated.

Note since docs are not versioned, this won't be backported and is being moved to newton1.

[Christian Berendt (berendt)]

Removed assignee, he is not working on this bug.