clean up folder used as pseudo branches of voltha pipeline-scripts

* delete all folders used as pseudo branches for older voltha releases
  (including the unused playground) since those pipeline-scripts are now
  pulled in from the respective release branches for ci-management and
  are not needed in master anymore
* move all files from pseudo branch jjb/pipeline/voltha/master folder to
  jjb/pipeline/voltha folder to remove the mention of a branch in the
  script repo path
* remove 'master/' from path for all active pipeline scripts
* remove makefile used previously to copy folders as pseudo branches for
  releases

Signed-off-by: Jan Klare <jan.klare@bisdn.de>
Change-Id: Ib2f93ec021d0e12f70d550ccadd812c6408bf1ce
Signed-off-by: Jan Klare <jan.klare@bisdn.de>
diff --git a/jjb/voltha-e2e.yaml b/jjb/voltha-e2e.yaml
index 22add45..03a0b68 100755
--- a/jjb/voltha-e2e.yaml
+++ b/jjb/voltha-e2e.yaml
@@ -2092,7 +2092,7 @@
 - job-template:
     id: 'voltha-periodic-test'
     name: '{name}'
-    pipeline-script: 'voltha/master/bbsim-tests.groovy'
+    pipeline-script: 'voltha/bbsim-tests.groovy'
     pipeline-branch: 'master'
     build-node: 'ubuntu18.04-basebuild-8c-15g'
     robot-args: ''
@@ -2252,7 +2252,7 @@
     id: 'voltha-patch-test'
     name: 'verify_{project}_sanity-test{name-extension}'
     build-node: 'ubuntu18.04-basebuild-4c-8g'
-    pipeline-script: 'voltha/master/bbsim-tests.groovy'
+    pipeline-script: 'voltha/bbsim-tests.groovy'
     pipeline-branch: 'master'
     override-branch: '$GERRIT_BRANCH'
     sandbox: true
@@ -2582,7 +2582,7 @@
                   Created by Andy Bavier, andy@opennetworking.org <br />
                   Copyright 2019-2023 Open Networking Foundation (ONF) and the ONF Contributors
     sandbox: true
-    pipeline-script: 'voltha/master/tucson-build-and-test.groovy'
+    pipeline-script: 'voltha/tucson-build-and-test.groovy'
     pipeline-branch: 'master'
     default-test-args: '-i sanityORDeleteOLT -i PowerSwitch -X'
     build-node: 'tucson-pod'
@@ -2647,7 +2647,7 @@
     config-pod: 'tucson-pod'
     oltDebVersionMaster: 'openolt_asfvolt16-3.7.4-3b190f027136e845c5850a5b1a97897ce2b74ebf-40G-NNI.deb'
     oltDebVersionVoltha23: 'openolt_asfvolt16-3.4.9-e2a9597f3d690fe3a0ea0df244571dfc9e8c2833-40G-NNI.deb'
-    pipeline-script: 'voltha/master/tucson-build-and-test.groovy'
+    pipeline-script: 'voltha/tucson-build-and-test.groovy'
     pipeline-branch: 'master'
     trigger-string: 'hardware test'
     default-test-args: '-i sanityORDeleteOLT -i PowerSwitch -X'