input spec for BP:openstack main stream components plugin

Change-Id: I0f6a81e7477f3d7c948bfc51cd79a8dc8b557dd7

specs/ocata/approved/ironic-valence-plugin.rst

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+
+===================================
+OpenStack Ironic Plugin for Valence
+===================================
+
+This proposal adds the connection between ironic and valence.
+
+BP link:https://blueprints.launchpad.net/openstack-valence/+spec/openstack-components-plugin
+
+Problem description
+===================
+From OpenStack's framework level, valence now is a independent project of OpenStack,
+too independent to connect with other OpenStack components. This will bring a gap to OpenStack
+users as well as the community.
+
+From valence roadmap's level, valence has a great available space to OpenStack especially Ironic!
+They could have a awesome collaborative work for users on dataceners resource management. But it
+is still lack of the connections.
+
+Setup the connection and cover the roadmaps on both side will bring a profound influence.
+
+Proposed change
+===============
+We should have to setup a driver for valence in ironic that has already supported by ironic for
+users to insert their own customized driver. The driver can let ironic communicate with other
+service. So we would setup a valence driver in Ironic.
+
+And this is a big picture if we base on the base driver defined by Ironic itself. So i suggest
+that we should treat this spec as the parent spec, then split the whole plugin into small parts
+and child spec. Then we could schedue the priority of each part to match valence's growth.
+
+For example:
+BaseDriver of ironic should include these driver properties:
+* power
+* deploy
+* console
+* management
+* boot
+* vendor
+* inspect
+* raid
+* Other extend properties like pxe
+
+Not all these properties are required for valence, we just set priority for required property.
+Then contributors write child spec for each property and we would disscuss and contribute there.
+
+For example, shuquan has writen a child spec "pxe-rsd driver for ironic" link :
+https://review.openstack.org/#/c/401192/.
+
+Alternatives
+------------
+None
+
+
+Data model impact
+-----------------
+
+REST API impact
+---------------
+
+Driver API impact
+-----------------
+None
+
+Nova driver impact
+------------------
+None
+
+Security impact
+---------------
+None
+
+Other end user impact
+---------------------
+None
+
+Scalability impact
+------------------
+None
+
+Performance Impact
+------------------
+None
+
+Other deployer impact
+---------------------
+None
+
+Developer impact
+----------------
+None
+
+Implementation
+==============
+Assignee(s)
+-----------
+Primary assignee:
+  Bian.Hu
+
+Other contributors:
+  Andy yan
+  Yang Xing
+  Mao HaiJun
+  Wang Zhandong
+  Zhang Xiaotong
+
+Work Items
+----------
+* Setup a new plugin driver instance for valence in ironic
+* Match valence roadmap to figure out required driver properties
+* Implementation on the required property's features
+
+Testing
+=======
+* Unit tests: Mocking valence library.
+* Ironic commands: driver commands usage test
+
+Documentation Impact
+====================
+* TODO
+
+References
+==========
+None
+