Remove Virtualbox from lattice-ci Dockerfile
Remove Virtualbox from lattice-ci Dockerfile

[#104962476]

Signed-off-by: Colin Jackson <4f4efc23f45cfd2ccaeb623d4ab84100edb791f6@pivotal.io>

cloudfoundry-incubator/lattice-ci,cloudfoundry-incubator/lattice-ci,cloudfoundry-incubator/lattice-ci