Implement ironic resources

Add spec for implement ironic resources in heat.
blueprint: ironic-resource

Change-Id: I98c71e9d7fda1d61d29fcca3911ecfc76c8c322e

specs/ocata/ironic-resource.rst

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+==========================
+Implement ironic resources
+==========================
+
+https://blueprints.launchpad.net/heat/+spec/ironic-resource
+
+Add ironic resources in heat. This allow manage ironic through heat.
+Also allow other project's inner usage for ironic, like magnum, and tripleO
+might get benifits from it.
+
+
+Problem description
+===================
+
+We didn't have ways to fully control and manage ironic resources from
+orchestration service. For some service like Magnum, will have to use nova
+to create instance through heat without full manageability of ironic
+resources.
+
+Proposed change
+===============
+
+* Add Chassis and Port resources
+
+  These are admin only resources.
+  We already have a draft version of resource implement [1].
+
+* Add Node resource
+
+  This is an admin only resource.
+  This resource will not be duprecated to nova-ironic.
+  Actually more like a management set around nova-ironic.
+  Will not implement deloy functionality in resource.
+  For references, We already have a draft version of resource
+  implement [1]. You can also find WIP implementation around
+  mistral [2] in tripleo. And a ansible-playbook solution here
+  [3] and nova ironic driver solution [4] for further references.
+
+* Add warning messge in Node resource
+
+  This is an admin only resource.
+  Add warning message when admin try to use Node instead of nova Server
+  resource.
+
+* Add ironic manageability resources in ironic resources
+
+  These are admin only resources.
+  This include some status change like ironic node-set-xxx
+
+[1] https://review.openstack.org/#/q/project:openstack/heat+branch:master+topic:bp/ironic-resource,n,z
+[2] https://review.openstack.org/#/c/313048/
+[3] https://github.com/openstack/bifrost
+[4] https://github.com/openstack/nova/blob/master/nova/virt/ironic/driver.py
+
+Alternatives
+------------
+
+None
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Primary assignee:
+  rico-lin <rico.lin.guanyu@gmail.com>
+  Steven Hardy <shardy@redhat.com>
+
+Milestones
+----------
+
+Target Milestone for completion:
+  ocata-1
+
+Work Items
+----------
+
+* Add Chassis, Node, and Port resources
+* Add warning messge in Node resource
+* Add ironic manageability resource in ironic resources
+
+Dependencies
+============
+
+None