Improve Vagrantfile error message when un-versioned
Improve Vagrantfile error message when un-versioned

[#100705672]

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

datachand/lattice,felipeg48/lattice,SrinivasChilveri/lattice,Klaudit/lattice,SrinivasChilveri/lattice,cloudfoundry-incubator/ltc,Klaudit/lattice,svrc-pivotal/lattice,davidwadden/lattice,davidwadden/lattice-release,davidwadden/lattice-release,Klaudit/lattice,datachand/lattice,svrc-pivotal/lattice,svrc-pivotal/lattice,Klaudit/lattice,SrinivasChilveri/lattice,SrinivasChilveri/lattice,datachand/lattice,davidwadden/lattice,svrc-pivotal/lattice,datachand/lattice,felipeg48/lattice,cloudfoundry-incubator/ltc