util/packer: Remove extra packages from vagrant image

Signed-off-by: Jonathan Rudenberg <jonathan@titanous.com>
script: Bump Ubuntu box version in release-vm-images

Signed-off-by: Jonathan Rudenberg <jonathan@titanous.com>
util/packer: gitignore ova files

Signed-off-by: Jonathan Rudenberg <jonathan@titanous.com>
Merge pull request #453 from flynn/vm-fixes

Vagrant VM fixes