Add Vagrantfile-aio-neutron

Implements: blueprint reference-havana-vagrant

- Add a working vagrantfile and environment file for a working allinone
  using neutron as the networking component, and openvswitch as the
  neutron plugin

Change-Id: Ib7743dc2b822176d5c9e63396182ec7dfa9de7be
Merge "Add Vagrantfile-aio-neutron"