Add comments to check_preexisting_dcos()
Add comments to check_preexisting_dcos()

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