Fix bootstrap loader so extracted files don't have to be on sys.path.

--HG--
branch : setuptools
extra : convert_revision : svn%3A6015fed2-1504-0410-9fe1-9d1591cc4771/sandbox/trunk/setuptools%4040993

setuptools/command/bdist_egg.py

@@ -74,11 +74,11 @@ class bdist_egg(Command):
         f.write('\n'.join([
             "def __bootstrap__():",
             "   global __bootstrap__, __loader__, __file__",
-            "   import sys, pkg_resources",
+            "   import sys, pkg_resources, imp",
             "   __file__ = pkg_resources.resource_filename(__name__,%r)"
                 % resource,
             "   del __bootstrap__, __loader__",
-            "   reload(sys.modules[__name__])",
+            "   imp.load_dynamic(__name__,__file__)",
             "__bootstrap__()",
             "" # terminal \n
         ]))