[CORD-3050]v3 Better exclude for broken chart in voltha repo

Change-Id: If9f8cfbdab128c62cb9fc81bc20f1edca181d3d1
diff --git a/jjb/shell/helmlint.sh b/jjb/shell/helmlint.sh
index 16184c2..27cf676 100755
--- a/jjb/shell/helmlint.sh
+++ b/jjb/shell/helmlint.sh
@@ -34,7 +34,7 @@
   chartdir=$(dirname "${chart}")
 
   # update requirements if it exists. Skip voltha as it has non-clean reqirements
-  if [ "${chartdir}" != "./voltha" ] && [ -f "${chartdir}/requirements.yaml" ]; then
+  if [[ ! $chartdir =~ voltha$ ]] && [ -f "${chartdir}/requirements.yaml" ]; then
     helm dependency update "${chartdir}"
   fi