Vagrantfile update

- add omnibus option (set via config.yml)
- include berkshelf plugin
- add some overrides to the openstack settings (via config.yml)
- include setting the floating IP
update recipe (bump minor version)

This at the moment works with heat from openstack/heat's master branch.
In addition to the changes needed for that,

- the services have been given service resources
- the `heat-engine.conf` config file is created
- some dependencies have been added