enable unsupported_hardware option to install Fuel on hardware not supported by Centos distro

[Meg McRoberts]

https://bugs.launchpad.net/fuel/+bug/1322502 adds support for the unsupported_hardware command line option
that allows Fuel to run on hardware that is not supported by the CentOS distro being used. The User Guide needs
to include a section about how to use this option.

This section should not be in the main installation flow but rather afterwards, with a reference to it in the
http://docs.mirantis.com/openstack/fuel/master/user-guide.html#create-a-new-openstack-environment section.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/134961

[Matthew Mosesohn (raytrac3r)]

Related to https://bugs.launchpad.net/fuel/+bug/1322502 but it was never fixed in deployed nodes. I made a new patch that addresses this. Documentation is not needed.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/134961
Committed: https://git.openstack.org/cgit/stackforge/fuel-library/commit/?id=2287519c3e8833166e13bd191559d15205eebb11
Submitter: Jenkins
Branch: master

commit 2287519c3e8833166e13bd191559d15205eebb11
Author: Matthew Mosesohn <email address hidden>
Date: Mon Nov 17 17:53:20 2014 +0400

    Suppress unsupported_hardware error in CentOS

    This error is ignorable and can interfere with
    large deployments. Adds unsupported_hardware
    command to CentOS kickstart.

    Change-Id: I929976db04a847a5255407c506ec562ae77995f5
    Closes-Bug: #1359494

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/132930
Committed: https://git.openstack.org/cgit/stackforge/fuel-docs/commit/?id=44336fc227d19bf833c0b391a64183f2ae293fd4
Submitter: Jenkins
Branch: master

commit 44336fc227d19bf833c0b391a64183f2ae293fd4
Author: Meg McRoberts <email address hidden>
Date: Tue Nov 4 23:31:31 2014 -0800

    Kernel parameters -- how to set

    New section in Operations Guide
    This section includes info about using Cobbler web UI.

    User Guide: new section for Settings/kernel parameter

    Removed details from iommu section in Release Notes and replaced
    it with an xref to the new section in Ops Guide

    Change-Id: I0870c636f241ec83b1ce02873d20251281e29b35
    Partial-Bug: 1324483
    Partial-Bug: 1359494