Building or downloading a deploy ramdisk image in Installation Guide for Bare Metal Service

[fxpester]

guide for building coreos images on ubuntu 14.04 is missing `apt install cgroup-lite`

error is 'system error mountpoint not found'

This bug tracker is for errors with the documentation, use the following as a template and remove or add fields as you see fit. Convert [ ] into [x] to check boxes:

- [ ] This doc is inaccurate in this way: ______
- [ ] This is a doc addition request.
- [ ] I have a fix to the document that I can paste below including example: input and output.

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-----------------------------------
Release: 0.1 on 2017-06-28 00:56
SHA: 352120378f471214d51a71db9fbcb7586b9a5457
Source: https://git.openstack.org/cgit/openstack/ironic/tree/install-guide/source/deploy-ramdisk.rst
URL: https://docs.openstack.org/project-install-guide/baremetal/draft/deploy-ramdisk.html

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/516399

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/516399
Committed: https://git.openstack.org/cgit/openstack/ironic/commit/?id=445dff0a7a4c1d587ce7d9d692e3b18ec9ec1322
Submitter: Zuul
Branch: master

commit 445dff0a7a4c1d587ce7d9d692e3b18ec9ec1322
Author: Julia Kreger <email address hidden>
Date: Mon Oct 30 12:52:01 2017 -0400

    Fix minor documentation missing dependency

    The cgroup-lite package which is a dependency for docker,
    was not on the example command line, but is present in
    the helper script. Since the documentation details manual
    steps, we should include that the packages is required.

    Change-Id: I536824467d4a175f666dfe635cf0669d1e587ccb
    Closes-Bug: #1701258

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/ironic 9.2.0 release.