cockroach: use /bin/sleep for ubuntu support
cockroach: use /bin/sleep for ubuntu support

kensipe/dcos,mesosphere-mergebot/mergebot-test-dcos,dcos/dcos,GoelDeepak/dcos,mesosphere-mergebot/dcos,GoelDeepak/dcos,mesosphere-mergebot/dcos,mesosphere-mergebot/mergebot-test-dcos,GoelDeepak/dcos,mesosphere-mergebot/dcos,dcos/dcos,dcos/dcos,mesosphere-mergebot/mergebot-test-dcos,dcos/dcos,GoelDeepak/dcos,mesosphere-mergebot/mergebot-test-dcos,dcos/dcos,kensipe/dcos,kensipe/dcos,mesosphere-mergebot/dcos,kensipe/dcos