[VOL-4415] Moved voltctl installation to its own keyword

Change-Id: Id58162b7a100efda715a837dc87959cdf4bf1307
diff --git a/jjb/pipeline/voltha/master/physical-build.groovy b/jjb/pipeline/voltha/master/physical-build.groovy
index ce4b8ad..51dea2c 100644
--- a/jjb/pipeline/voltha/master/physical-build.groovy
+++ b/jjb/pipeline/voltha/master/physical-build.groovy
@@ -92,6 +92,7 @@
     stage('Install Voltha')  {
       steps {
         timeout(20) {
+          installVoltctl("${branch}")
           script {
             // if we're downloading a voltha-helm-charts patch, then install from a local copy of the charts
             def localCharts = false