Added plugin specs document

Change-Id: I778410c0e82b6fce21d2a1fa1a12fd4e337bc7ea

spec/scaleio-plugin-spec.rst

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+===================
+ScaleIO Fuel plugin
+===================
+
+ScaleIO plugin for Fuel extends Mirantis OpenStack functionality by adding
+support for deploying and configuring ScaleIO clusters as block storage backend.
+
+Problem description
+===================
+
+Currently, Fuel has no support for ScaleIO clusters as block storage backend for
+OpenStack environments. ScaleIO plugin aims to provide support for it.
+This plugin will deploy a ScaleIO cluster and configure the OpenStack environment
+to consume the block storage services from ScaleIO.
+
+Proposed change
+===============
+
+Implement a Fuel plugin that will deploy a ScaleIO cluster and configure the
+ScaleIO Cinder driver on all Controller and Compute nodes.
+
+Alternatives
+------------
+None
+
+Data model impact
+-----------------
+
+None
+
+REST API impact
+---------------
+
+None
+
+Upgrade impact
+--------------
+
+None
+
+Security impact
+---------------
+
+None
+
+Notifications impact
+--------------------
+
+None
+
+Other end user impact
+---------------------
+
+None
+
+Performance Impact
+------------------
+
+The ScaleIO storage clusters provide high performance block storage for
+OpenStack environments. Therefore, enabling the ScaleIO plugin in OpenStack
+will greatly improve performance of OpenStack block storage operation.
+
+Other deployer impact
+---------------------
+
+None
+
+Developer impact
+----------------
+
+None
+
+Implementation
+==============
+
+This plugin contains several tasks:
+
+* The first task installs the ScaleIO cluster. All nodes will contribute to the
+storage pool by the amount specified by the user in the configuration process.
+Controllers 1, 2, and 3 will contain the MDM and the Gateway in HA mode.
+* The second task configures the ScaleIO gateway to avoid interference with the
+Horizon dashboard.
+* The third task enables HA in the ScaleIO gateway instances.
+* The fourth task configures all Compute nodes to use ScaleIO backend.
+* The fifth task configures all Controller nodes to use ScaleIO backend.
+* The sixth task creates and configures a Cinder volume type with the parameters
+from the ScaleIO cluster.
+
+
+Assignee(s)
+-----------
+| Adrian Moreno Martinez <adrian.moreno@emc.com>
+| Magdy Salem <magdy.salem@emc.com>
+| Patrick Butler Monterde <patrick.butlermonterde@emc.com>
+
+Work Items
+----------
+
+* Implement the Fuel plugin.
+* Implement the Puppet manifests.
+* Testing.
+* Write the documentation.
+
+Dependencies
+============
+
+* Fuel 6.1.
+
+Testing
+=======
+
+* Prepare a test plan.
+* Test the plugin by deploying environments with all Fuel deployment modes.
+
+Documentation Impact
+====================
+
+* Deployment Guide (how to install the storage backends, how to prepare an
+  environment for installation, how to install the plugin, how to deploy an
+  OpenStack environment with the plugin).
+* User Guide (which features the plugin provides, how to use them in the
+  deployed OpenStack environment).
+* Test Plan.
+* Test Report.