Howto release doc additions

code/release-bugfix.rst
-----------------------
  o Howto create a release branch patch

howto/release/overview.rst
--------------------------
  o Early writeup of release actions.
  o Edits needed for both branch=release and branch=master

Change-Id: I34ecc54217b2f185f7737f3244fceb2a4ddf4c5d
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+.. _coding-release-bugfix:
+
+Create a patch on a release branch
+==================================
+
+Clone & Checkout Release Branch
+-------------------------------
+
+.. code-block:: shell-session
+   :caption: Release patch: checkout
+
+   # ------------------------------------------------
+   # Clone a repostiory of interest (ex: votlha-lib-go)
+   # Checkout release branch voltha-2.12 for patching
+   # ------------------------------------------------
+   % git clone "ssh://gerrit.opencord.org:29418/voltha-lib-go.git"
+   % cd voltha-lib-go
+   % git checkout voltha-2.12
+
+   # ------------------------------------------------------
+   # Or if something is amiss checkout by tag for diagnosis
+   # ------------------------------------------------------
+   % cat VERSION
+   % git checkout tags/v{VERSION-FILE-STRING}
+
+Command output
+
+::
+   % git checkout voltha-2.12
+   Branch 'voltha-2.12' set up to track remote branch 'voltha-2.12' from 'origin'.
+   Switched to a new branch 'voltha-2.12'
+
+
+.. code-block:: shell-session
+   :caption: Create a dev branch from release
+
+   % git checkout -b dev-joey
+   % git branch -a
+
+     master
+   * voltha-2.12                          <<---** Commits land here
+     remotes/origin/HEAD -> origin/master
+     remotes/origin/master
+     remotes/origin/voltha-2.11
+     remotes/origin/voltha-2.12
+
+
+Verify sandbox tag and branch are release
+-----------------------------------------
+
+.. code-block:: shell-session
+   :caption: Release patch: Verify checkout
+
+   # ----------------------------------------------------------------
+   # Verify tags and branch for your release patch are correct.
+   # HEAD will be attached to the branch (and most recent release tag)
+   # ----------------------------------------------------------------
+   % git fetch --tags
+   % cat VERSION
+     7.5.3
+   % git log --graph --decorate --oneline $@
+
+HEAD will be attached to origin/voltha-2.12 and the latest release tag v7.5.3
+
+::
+
+   git log --graph --decorate --oneline $@
+
+   * aeb3c4f (HEAD -> voltha-2.12, tag: v7.5.3, origin/voltha-2.12) [VOL-5245] -- release patch
+   * ad265dd (tag: v7.5.2) [VOL-5245] - branch and release repo:voltha-lib-go
+   * 9cdee9f (tag: v7.5.1, tag: v2.12.0) [VOL-5245] branch and release repo:voltha-lib-go
+
+
+Edit and commit
+---------------
+
+.. code-block:: shell-session
+   :caption: Edit, commit, rebase and review
+
+   # ----------------------------------------------------------------
+   # Edit sources to taste
+   # ----------------------------------------------------------------
+   {emacs,vi,$EDITOR} ...
+
+   # :ref:`pull-request--commit-message`
+   % git commit -F ./commit-message
+
+
+Rebase against the release branch
+---------------------------------
+
+.. code-block:: shell-session
+   :caption: Rebase against release branch ``NOT branch=master``
+
+   # Run one of
+   % rebase -i HEAD
+   % rebase -i voltha-2.12
+
+
+Code Review
+-----------
+
+.. code-block:: shell-session
+   :caption: Push to gerrit, code review
+
+   % git review --reviewers foo@bar.tans
+
+
+Verify Patch
+------------
+
+Now visit gerrit and verify your release bugfix is correctly decorated.
+In gerrit, review the 'Repo|Branch' item in the top left corner.
+'votlha-2.12' or the release tag will be visible.  If branch 'master' is
+listed abandon the patch beucase it will not be applied to the proper branch.