fixes validation checks for `dcos6`
fixes validation checks for `dcos6`

GoelDeepak/dcos,GoelDeepak/dcos,mellenburg/dcos,surdy/dcos,mesosphere-mergebot/dcos,mesosphere-mergebot/mergebot-test-dcos,dcos/dcos,mesosphere-mergebot/mergebot-test-dcos,dcos/dcos,mellenburg/dcos,mellenburg/dcos,GoelDeepak/dcos,kensipe/dcos,dcos/dcos,GoelDeepak/dcos,mesosphere-mergebot/mergebot-test-dcos,branden/dcos,kensipe/dcos,amitaekbote/dcos,amitaekbote/dcos,branden/dcos,dcos/dcos,branden/dcos,mesosphere-mergebot/mergebot-test-dcos,kensipe/dcos,dcos/dcos,kensipe/dcos,surdy/dcos,amitaekbote/dcos,mesosphere-mergebot/dcos,amitaekbote/dcos,mesosphere-mergebot/dcos,mesosphere-mergebot/dcos,surdy/dcos,branden/dcos,mellenburg/dcos,surdy/dcos