Updated voltctl version for voltha-2.8 jobs

Change-Id: I3dba13fef091000f682363bc8ed41dc8951bc736
diff --git a/jjb/pipeline/voltha/voltha-2.8/voltha-tt-physical-functional-tests.groovy b/jjb/pipeline/voltha/voltha-2.8/voltha-tt-physical-functional-tests.groovy
index c9f4092..7ed2c37 100644
--- a/jjb/pipeline/voltha/voltha-2.8/voltha-tt-physical-functional-tests.groovy
+++ b/jjb/pipeline/voltha/voltha-2.8/voltha-tt-physical-functional-tests.groovy
@@ -101,7 +101,7 @@
         bash <( curl -sfL https://raw.githubusercontent.com/boz/kail/master/godownloader.sh) -b "$WORKSPACE/bin"
         cd $WORKSPACE
         if [ "${params.branch}" == "voltha-2.8" ]; then
-           VOLTCTL_VERSION=1.6.10
+           VOLTCTL_VERSION=1.6.11
         else
            VOLTCTL_VERSION=\$(curl -sSL https://api.github.com/repos/opencord/voltctl/releases/latest | jq -r .tag_name | sed -e 's/^v//g')
         fi