[VOL-5170] - Test debugging openolt-adapter-sanity-test-voltha

jjb/voltha-e2e/voltha-2.8.yaml
------------------------------
  o Cosmetic edit to force job regeneration

vars/pgre_port_forward.groovy
vars/pkill_port_forward.groovy
------------------------------
  o Fix a silly typo, join() list into string.

Change-Id: I12f54c20f51635541af2d4e4dca8429e93b6d61f
diff --git a/jjb/voltha-e2e/voltha-2.8.yaml b/jjb/voltha-e2e/voltha-2.8.yaml
index 912e530..994a79d 100644
--- a/jjb/voltha-e2e/voltha-2.8.yaml
+++ b/jjb/voltha-e2e/voltha-2.8.yaml
@@ -30,7 +30,7 @@
           code-branch: 'voltha-2.8'
           extraHelmFlags: '--set kafka.externalAccess.enabled=true,kafka.externalAccess.service.type=NodePort,kafka.externalAccess.service.nodePorts[0]=30201,kafka.externalAccess.service.domain=127.0.0.1'
           time-trigger: "H H/23 * * *"
-          logLevel: 'INFO'
+          logLevel: 'DEBUG'
           testTargets: |
             - target: voltha-pm-data-single-kind-att
               workflow: att