Spec for fuel-networking-sfc plugin

Change-Id: Ie8e29b46661c1baf207fbf60473d20bfce8b22d8

spec/fuel-plugin-networking-sfc-spec.rst

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+..
+ This work is licensed under the Apache License, Version 2.0.
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+=============================
+Networking sfc plugin
+=============================
+
+Fuel Networking SFC plugin extends Mirantis OpenStack functionality by
+installing networking sfc support.
+
+Problem description
+===================
+
+Currently, Fuel has no support for  Networking SFC. Networking sfc plugin aims
+to provide support for it.
+
+Proposed change
+===============
+
+Implement a Fuel plugin that will install Networking SFC support.
+
+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
+------------------
+
+Networking SFC plugin has no direct performance impact on OpenStack, but it
+consumes additional resources (CPU, memory, database) and this should be
+considered and tested on a test environment before production use.
+
+Other deployer impact
+---------------------
+
+None
+
+Developer impact
+----------------
+
+None
+
+Implementation
+==============
+
+Plugin delivers Networking SFC support for Fuel. Plugin has several tasks:
+
+* The first task changes package fuel-ha-utils which comes from base Fuel 9.0
+  to package with applied fix https://review.openstack.org/#/c/334415.
+  It's needed for proper Networking SFC deployment with Fuel 9.0.
+* The second task concerns controllers. Installs networking-sfc package on
+  controllers and configures Fuel to use it.
+* The third task concerns computes nodes. Installs networking-sfc package on
+  computes and configures Fuel to use it.
+
+Networking SFC is installed on all environments which have plugin enabled.
+Plugin configures all needed Openstack services.
+
+Assignee(s)
+-----------
+
+| Szymon Bańka <sbanka@mirantis.com> (PM)
+| Maciej Relewicz <mrelewicz@mirantis.com> (developer)
+| Bartosz Kupidura <bkupidura@mirantis.com> (developer)
+| Damian Szeluga <dszeluga@mirantis.com> (developer)
+
+Work Items
+----------
+
+* Implement the Fuel plugin.
+* Implement the Puppet manifests.
+* Testing.
+* Write the documentation.
+
+Dependencies
+============
+
+* Fuel 9.0
+
+Testing
+=======
+
+* Prepare a test plan.
+* Test the plugin by deploying environments with all Fuel deployment modes.
+
+Documentation Impact
+====================
+
+* Deployment Guide (how to install the plugin, how to configure and 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.
+
+References
+==========
+
+* `Official networking sfc repository
+  <https://github.com/openstack/networking-sfc>`_