restarting docker service before building images

Change-Id: Ic22a4ab653705974a7913525031555507c333856
diff --git a/jjb/pipeline/voltha-atest-provisioning.groovy b/jjb/pipeline/voltha-atest-provisioning.groovy
index cd6552f..2856bb2 100755
--- a/jjb/pipeline/voltha-atest-provisioning.groovy
+++ b/jjb/pipeline/voltha-atest-provisioning.groovy
@@ -38,6 +38,7 @@
     stage ('Build Voltha and ONOS') {
       steps {
         sh '''
+        sudo service docker restart
         cd $WORKSPACE/cord/incubator/voltha
         chmod +x env.sh
         source env.sh