[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/.wip/periodic-voltha-pm-data-test-bbsim-2.8/paths b/.wip/periodic-voltha-pm-data-test-bbsim-2.8/paths
new file mode 100644
index 0000000..00b7db6
--- /dev/null
+++ b/.wip/periodic-voltha-pm-data-test-bbsim-2.8/paths
@@ -0,0 +1,2 @@
+jjb/software-upgrades.yaml
+jjb/voltha-e2e.yaml