Teach cpan about CPAN::Mini

Our mirror won't do us much good unless we use it:
 
--- /Users/jeff/.cpan/CPAN/MyConfig.pm.a	2009-08-11 21:40:04.000000000 -0700
+++ /Users/jeff/.cpan/CPAN/MyConfig.pm	2009-01-14 19:33:26.000000000 -0800
@@ -62,3 +62,3 @@
   'unzip' => q[/usr/bin/unzip],
-  'urllist' => [q[ftp://cpan.thepirtgroup.com/]],
+  'urllist' => [q[http://localhost/~jeff/CPAN/], q[ftp://cpan.thepirtgroup.com/]],
   'use_sqlite' => q[1],