refactor 3dt
refactor 3dt

- replace log with logrus
- fix https://dcosjira.atlassian.net/browse/DCOS-432
- code cleanup
https://github.com/dcos/3dt/pull/71

vishnu2kmohan/dcos,mesosphere-mergebot/mergebot-test-dcos,xinxian0458/dcos,branden/dcos,mnaboka/dcos,dcos/dcos,BenWhitehead/dcos,jeid64/dcos,vishnu2kmohan/dcos,lingmann/dcos,mesosphere-mergebot/mergebot-test-dcos,mesosphere-mergebot/dcos,asridharan/dcos,lingmann/dcos,surdy/dcos,darkonie/dcos,xinxian0458/dcos,dcos/dcos,darkonie/dcos,kensipe/dcos,mellenburg/dcos,dcos/dcos,amitaekbote/dcos,jeid64/dcos,mellenburg/dcos,dcos/dcos,mnaboka/dcos,BenWhitehead/dcos,jeid64/dcos,asridharan/dcos,mesosphere-mergebot/mergebot-test-dcos,mesosphere-mergebot/dcos,GoelDeepak/dcos,branden/dcos,darkonie/dcos,GoelDeepak/dcos,vishnu2kmohan/dcos,surdy/dcos,GoelDeepak/dcos,amitaekbote/dcos,amitaekbote/dcos,branden/dcos,asridharan/dcos,darkonie/dcos,surdy/dcos,mnaboka/dcos,xinxian0458/dcos,mnaboka/dcos,mellenburg/dcos,mellenburg/dcos,mesosphere-mergebot/dcos,amitaekbote/dcos,jeid64/dcos,asridharan/dcos,kensipe/dcos,BenWhitehead/dcos,dcos/dcos,mnaboka/dcos,GoelDeepak/dcos,kensipe/dcos,kensipe/dcos,mesosphere-mergebot/dcos,surdy/dcos,BenWhitehead/dcos,xinxian0458/dcos,darkonie/dcos,branden/dcos,mesosphere-mergebot/mergebot-test-dcos,lingmann/dcos,lingmann/dcos,vishnu2kmohan/dcos