packer: config for vagrant
packer: new gitignore rules
packer: test Vagrantfile and salt-minion.conf
fixup! 41552445
salt: updated prod_vars
salt: updated salt-formulae for unattended-upgrades refs mafrosis/salt-formulae@92706d6
salt: fix bug in prod build since mafrosis/salt-formulae@4beca75
salt: install gevent in prod
packer: symlinked salt-formulae for packer build