python-jwt: adjust build file to python3.6
python-jwt: adjust build file to python3.6

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