SEBA-243 Update Packer build with kubeadm (for E2E test)

Change-Id: Idb8e4340991c8930cdf45a3aa25ab223ffef8e82
diff --git a/packer/provision/baseline.sh b/packer/provision/baseline.sh
index e34d7b8..9c08069 100644
--- a/packer/provision/baseline.sh
+++ b/packer/provision/baseline.sh
@@ -228,6 +228,7 @@
     apt-get upgrade -m
     apt-get dist-upgrade -m
 
+    apt-get update -m
     ensure_ubuntu_install unzip xz-utils puppet git libxml-xpath-perl
 
     # install Java 7