[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/vars/pgrep_port_forward.groovy b/vars/pgrep_port_forward.groovy
index 68c5e5a..0862aef 100644
--- a/vars/pgrep_port_forward.groovy
+++ b/vars/pgrep_port_forward.groovy
@@ -58,7 +58,7 @@
         '--list-full',
         '--full',  // hmmm: conditional use (?)
         "'${proc}",
-    ]
+    ].join(' ')
 
     print("""
 ** -----------------------------------------------------------------------