It looks like it was removed in PR 1050.  Updating to the changeset before that was merged in (e816afd), the mapserver dies with the following traceback:

http://paste.yt-project.org/show/4977/


On Wed, Jul 30, 2014 at 6:03 PM, Cameron Hummels <chummels@gmail.com> wrote:
Does anyone know what happened to the mapserver in 3.0?  It is no longer in command_line.py, and the docs are in conflict about it working.  I'll fix this, but I wanted to know if it had been removed on purpose.

--
Cameron Hummels
Postdoctoral Researcher
Steward Observatory
University of Arizona

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