Vagrant changes

Update the vagrantfile to create 4 VM's: Ubuntu 12.04, Ubuntu 14.04, Centos 6 and Centos 7 boxes, and connect chef-solo as the provisioner.
This is changed to `default['huginn']['database']['password']` now if that will make a difference.

`default['mysql']['server_root_password'] = node['huginn']['database']['password']`