Remove sudo from installing packages

Change-Id: Iee63f6494a989ec895be74cd2df8276bab1f78e0
Signed-off-by: Mike Marchetti <mmarchetti@sandvine.com>

packer/ubuntu1604-juju.json

@@ -2,7 +2,6 @@
   "provisioners": [
     {
       "type": "shell",
-      "execute_command": "echo 'vagrant' | {{.Vars}} sudo -S -E bash '{{.Path}}'",
       "script": "scripts/install_packages.sh"
     },
     {