refresh before apt-transport-https

Change-Id: I237d9ac41f6ea23f64d266859dfceb4edec56005
diff --git a/lab-pipeline.groovy b/lab-pipeline.groovy
index d426d3e..b183fe7 100644
--- a/lab-pipeline.groovy
+++ b/lab-pipeline.groovy
@@ -125,7 +125,7 @@
                     salt.runSaltProcessStep(saltMaster, '* and not kvm*', 'saltutil.sync_all')
 
                     // workaround - install apt-transport-https
-                    salt.runSaltProcessStep(saltMaster, '* and not kvm*', 'pkg.install', ['apt-transport-https'])
+                    salt.runSaltProcessStep(saltMaster, '* and not kvm*', 'pkg.install', ['apt-transport-https refresh=True'])
                     salt.runSaltProcessStep(saltMaster, '* and not kvm*', 'state.sls', ['linux,openssh,salt.minion,ntp'])
                 }