[VOL-5010] - Clone unit tests onto a v2.12 branch

[VOL-5005] - Create a v2.12 release branch for test jobs.
[VOL-5004] - Deprecate voltha-2.8 unit tests

makefiles/release/include.mk
makefiles/release/help.mk
makefiles/release/voltha-versions.mk
makefiles/release/targets.mk
makefiles/release/targets/voltha-certification.mk
makefiles/release/targets/voltha-e2e.mk
makefiles/release/targets/voltha-nightly-jobs.mk
-------------------------------------------------
  o Define make targets to create versioned subdirectories.
  o 'branched' unit test files will live in subdirs.
  o Refactoring still in progress, v2.8 tests are disabled/retired in the interim.

jjb/voltha-e2e.yaml
jjb/pipeline/voltha/voltha-2.12/
jjb/voltha-test/voltha-nightly-jobs/voltha-2.12.yaml
----------------------------------------------------
  o Create versioned subdirectories to support v2.12 unit testing.

jjb/voltha-e2e.yaml
jjb/voltha-e2e/voltha-master.yaml
jjb/voltha-e2e/voltha-2.12.yaml
jjb/voltha-e2e/voltha-2.8.yaml
--------------------------------
  o Guineapig: periodic-voltha-pm-data-test-bbsim
  o Refactor unit test from voltha-e2e.yaml.
  o Create new v2.12 pipeline job.
  o Disable pre-lts legacy pipeline job 2.8
  o Refactoring one test so job state in all branches can be checked.
  o Tomorrow verify the v2.8 job did not launch

Change-Id: Ib550fae395e1a416466c2f5fb9640be8405dc39e
diff --git a/jjb/voltha-e2e/README b/jjb/voltha-e2e/README
new file mode 100644
index 0000000..8b57f6f
--- /dev/null
+++ b/jjb/voltha-e2e/README
@@ -0,0 +1,7 @@
+This directory is used for refactoring and breakup of the kitchen sink
+JJB job yaml template that contains all versioned VOLTHA test stuies.
+
+git branches are not used, all jobs are visible.
+To support modular branch based testing naming conventions that include
+some form of voltha-X.YY will be used within configs and templates to
+support separation of jobs by release branch.
\ No newline at end of file