[Distutils] short circuiting module lookups

[P.J. Eby]

At 11:54 PM 4/7/2009 +1200, Noah Gift wrote:
>1.  In the case of entry points for setuptools, it actually recurses
>into EVERY egg directory in your path, not just the egg you requested,
>adds them to your sys.path and additionally looks for four files
>inside of every egg.  On a laptop on local storage, this doesn't
>matter, but when thousands of machines hit the same filer, with many
>python processes, bad things happen...

Install your eggs with --multi-version, and then only the eggs that 
are required for the running script will be added to sys.path or have 
their contents opened.  (Installing them as zip files rather than 
directories may also speed this up.)