Fix bdist_dumb support to use .egg-info instead of .egg format.
Fix bdist_dumb support to use .egg-info instead of .egg format.

--HG--
branch : setuptools
extra : convert_revision : svn%3A6015fed2-1504-0410-9fe1-9d1591cc4771/sandbox/trunk/setuptools%4041716

pypa/setuptools,pypa/setuptools,pypa/setuptools