Project: mesos
Issue MESOS-5179: Enhance the error message for Duration flag.
Enhance the error message for https://github.com/apache/mesos/blob/4dfa91fc21f80204f5125b2e2f35c489f8fb41d8/3rdparty/libprocess/3rdparty/stout/include/stout/duration.hpp#L70 to list all of the supported duration unit.
Story points: 1