Add the ovsdb-docker Vagrant config

Given how sparsely configured this image actually is, it could probably
be easily used by any other project that needs Java7 (needed for being a
Jenkins slave at a minimum) and just docker after that.

Change-Id: I4022bb69d1a701a7d40d742f86af38835d3dd5c9
Signed-off-by: Andrew Grimberg <agrimberg@linuxfoundation.org>