[VOL-4114] Always sourcing the release file before kind-voltha commands

Change-Id: I123957db6e1212583c29a8b0c873cfcde721a390
diff --git a/jjb/pipeline/voltha/voltha-2.7/voltha-system-test-bbsim.groovy b/jjb/pipeline/voltha/voltha-2.7/voltha-system-test-bbsim.groovy
index 991ecee..d05077d 100644
--- a/jjb/pipeline/voltha/voltha-2.7/voltha-system-test-bbsim.groovy
+++ b/jjb/pipeline/voltha/voltha-2.7/voltha-system-test-bbsim.groovy
@@ -149,6 +149,12 @@
          extract_errors_python voltha-ofagent >> $WORKSPACE/error-report.log
 
          ## shut down kind-voltha
+         if [ "${branch}" != "master" ]; then
+           echo "on branch: ${branch}, sourcing kind-voltha/releases/${branch}"
+           source "$WORKSPACE/kind-voltha/releases/${branch}"
+         else
+           echo "on master, using default settings for kind-voltha"
+         fi
          cd $WORKSPACE/kind-voltha
 	       WAIT_ON_DOWN=y ./voltha down