Re-clone help-charts repo in cleanup stage

Change-Id: I2c0c958681b3fc7868298e245994f7d0f8ba8e56
(cherry picked from commit a40496ae1f2692abca622ad8a6ce0addf88e0c74)
diff --git a/Jenkinsfile-rcordlite-zerotouch b/Jenkinsfile-rcordlite-zerotouch
index f61295a..e3395a9 100644
--- a/Jenkinsfile-rcordlite-zerotouch
+++ b/Jenkinsfile-rcordlite-zerotouch
@@ -29,6 +29,8 @@
                         echo "Purging chart: \${hchart}"
                         helm delete --purge "\${hchart}"
                     done
+                    rm -rf helm-charts cord-tester
+                    git clone -b ${branch} https://gerrit.opencord.org/helm-charts
                     """
                     timeout(5) {
                         waitUntil {
@@ -251,7 +253,6 @@
             stage('Download cord-tester repo') {
                 timeout(2) {
                     sh returnStdout: true, script: """
-                    rm -rf cord-tester
                     git clone -b ${branch} https://gerrit.opencord.org/cord-tester
                     """
                 }