[RFE] In-band RAID configuration using IPA

[Vladyslav Drok]

This change proposes to implement the RAID interface which uses IPA.

[Ruby Loo (rloo)]

Spec has been approved and is available at http://specs.openstack.org/openstack/ironic-specs/specs/approved/inband-raid-configuration.html.

Copying this from the old BP (https://blueprints.launchpad.net/ironic/+spec/inband-raid-configuration):

Gerrit topic: https://review.openstack.org/#q,topic:bp/implement-cleaning-states,n,z

Addressed by: https://review.openstack.org/161066
    Add cleaning/zapping support to IPA

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Bumping to Liberty since this depends on the Zapping state (which has already been bumped)
- Devananda, 13 Mar 2015

Addressed by: https://review.openstack.org/196960
    Add raid configuration commands in clean extension

Gerrit topic: https://review.openstack.org/#q,topic:bp/ironic-generic-raid-interface,n,z

Addressed by: https://review.openstack.org/198238
    Add support for inband raid configuration agent ramdisk

Addressed by: https://review.openstack.org/222287
    Agent supports post-clean-step operations

Addressed by: https://review.openstack.org/222264
    Refactor deploy_utils methods

Addressed by: https://review.openstack.org/224938
    Agent Inband RAID configuration available in cleaning

Addressed by: https://review.openstack.org/220898
    Add support for in-band cleaning in ISCSIDeploy

Gerrit topic: https://review.openstack.org/#q,topic:(detached,n,z

Addressed by: https://review.openstack.org/235730
    Add self.raid for iSCSI based drivers