update devstack+ironic docn; not in ubuntu precise

[Ruby Loo]

Our documentation on deploying ironic with devstack [1] mentions Ubuntu 12.04, but Ironic needs Ubuntu 14.04 (trusty). The documentation should be updated to reflect this.

[1]
http://docs.openstack.org/developer/ironic/dev/dev-quickstart.html#deploying-ironic-with-devstack

[Adam Gandelman (gandelman-a)]

Devstack+ironic no longer gets run on 12.04 anywhere in the upstream CI gate. This means its bitrotting. This is causing confusion for users who are still attempting to run this on 12.04 and finding that some packages are unavailable. Some of these packages (docker.io) were added as part of the IPA work, but this was all targetted toward running on the 14.04 devstack slaves. Best to just drop support of 12.04 and point users to an environment that matches what we are testing / dev'ing against.

This also removes the requirement to setup cloud archive access, since the newer packages we depended on in the past are all available in Trusty.

[Dmitry Tantsur (divius)]

Unsetting "in progress" as nobody is assigned and no patch attached.

[Ruby Loo (rloo)]

Adam submitted https://review.openstack.org/#/c/122519/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/122519
Committed: https://git.openstack.org/cgit/openstack/ironic/commit/?id=d6bf24f48e00464110ca90f4c1e607020664271a
Submitter: Jenkins
Branch: master

commit d6bf24f48e00464110ca90f4c1e607020664271a
Author: Adam Gandelman <email address hidden>
Date: Thu Sep 18 13:28:44 2014 -0700

    Update devstack docs, require Ubuntu 14.04

    We no longer test deploying Devstack + Ironic on Precise 12.04 anywhere,
    so we should no longer promise that it is functional there. This removes steps
    of the DevStack documentation that sets up access to the Cloud Archive and
    explains that Ubuntu 14.04 is the minimum supported OS.

    Closes-bug: 1371300

    Change-Id: I99b7705c2c78443c7a95ff499b8c9fde33964c46