When running `vagrant up` I see a 404:

/ovsdb$ vagrant up
Bringing machine 'mininet' up with 'virtualbox' provider...
Bringing machine 'devstack-control' up with 'virtualbox' provider...
Bringing machine 'devstack-compute' up with 'virtualbox' provider...
==> mininet: Box 'trusty64' could not be found. Attempting to find and install...
mininet: Box Provider: virtualbox
mininet: Box Version: >= 0
==> mininet: Adding box 'trusty64' (v0) for provider: virtualbox
mininet: Downloading: http://opscode-vm-bento.s3.amazonaws.com/vagrant/virtualbox/opscode_ubuntu-14.10_chef-provisionerless.box
An error occurred while downloading the remote file. The error
message, if any, is reproduced below. Please fix this error and try
again.

The two URL's in ovsdb/Vagrantfile need to be corrected such that s/14.10/14.04/g. After that minor fix, all is well.