Add goal to drop Python 2.7 Support

Change-Id: Ifa9234c0ce85d51427b8e1f71573cd4a498bdc22

goals/selected/ussuri/drop-py27.rst

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+=======================
+Drop Python 2.7 Support
+=======================
+
+Ussuri cycle is the time to drop the python2 support from OpenStack.
+All the projects have completed all of the work of updating all of
+their CI jobs to work under Python 3. This goal accomplishes the drop
+of support for python2 by removing testing python2, as well as
+configuration required for that testing.  The only changes to the code
+a project would run in production are those required to fix py3
+compatibility, in the event that a job is converted to py3 that was
+not already.
+
+Along with py2.7 drop, we will use this goal to update the Python 3
+test runtimes for Ussuri :doc:`../../../reference/runtimes/ussuri`.
+
+* Storyboard stories TODO
+
+Champion
+========
+
+Ghanshyam Mann(gmann) <gmann@ghanshyammann.com> has volunteered to drive this goal.
+
+Gerrit Topic
+============
+
+To facilitate tracking, commits related to this goal should use the
+gerrit topic::
+
+  drop-py27-support
+
+Completion Criteria
+===================
+
+In order for a project to call this goal complete it must:
+
+#. Drop the python 2.7 unit, functional & integration testing.
+
+   This will update the python testing template from Train to Ussuri template.
+
+#. Migrate the python 2.7 job if no corresponding py3 job yet.
+
+#. Update tox.ini and setup.cfg to remove the py2.7
+
+#. Update requirements file to drop py2.7 specific dependency.
+
+#. Add release notes saying dropping py2.7 explicitly.
+
+   Python 2.7 support has been dropped. Last release <of project to> support
+   py2.7 is OpenStack Train. The minimum version of Python now
+   supported by <project> is Python 3.6.
+
+All these updates will go in a single patch.
+
+Projects keeping py2.7 support
+------------------------------
+
+#. Swift
+
+   * Swift is still fixing py3 bugs, want more than a single OpenStack release with both py2 and py3
+     support, and want to continue to support xenial.
+
+
+Schedule
+--------
+
+This will be divided into three phases. 3rd phase will be to audit the completion criteria.
+
+#. Phase-1: Now -> Ussuri-1 milestone (deadline R-22 )
+
+   * Project to start dropping the py2.7 support and finish by milestone-1.
+     Project needs to coordinate with third party CI or any backend drivers.
+     Example: Nova - http://lists.openstack.org/pipermail/openstack-discuss/2019-October/010109.html
+
+   * If there is any cross project dependency and removing the py2.7 support causing other projects
+     py27 jobs then failing job can be dropped immediately to unblock the gate and proceed on complete
+     cleanup in another patch.
+
+   * This includes horizon and its plugins.
+
+#. Phase-2: milestone-1 -> milestone-2 (deadline R-13 )
+
+   * Common libraries and testing tooling.
+
+   * This includes Oslo, QA tools (including Tempest plugins or any other testing tools), common lib
+     used among projects (os-brick), Client libraries. Tempest will drop the support during Feb as
+     discussed with TripleO.
+
+   * By milestone 1 which is phase-1 all the projects using those lib and testing tools should have
+     completed the removal of py2.7 support.
+
+#. Phase-3: at milestone-2
+
+   * openstack/requirements has to be the last one and will drop the support in phase-3.
+
+   * Final audit on Phase-1 and Phase-2 plan and make sure everything is done without breaking anything.
+     This is enough time to measure any break or anything extra to do before Ussuri final release.
+
+Details discussion:  https://etherpad.openstack.org/p/drop-python2-support
+
+References
+==========
+
+* https://etherpad.openstack.org/p/drop-python2-support
+
+* http://lists.openstack.org/pipermail/openstack-discuss/2019-October/010142.html
+
+Current State / Anticipated Impact
+==================================
+
+Few projects started dropping the py2.7 support.

goals/selected/ussuri/index.rst

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+======
+Ussuri
+======
+
+.. toctree::
+   :glob:
+   :maxdepth: 1
+
+   *