Bug 805127 - Upgrade virtualenv to 1.8.2; r=ted

Upstream tarball uncompressed in python/virtualenv. egg-info directory
was deleted. All other files are unchanged.

python/virtualenv/virtualenv_embedded/distutils-init.py

@@ -1,6 +1,7 @@
 import os
 import sys
 import warnings 
+import imp
 import opcode # opcode is not a virtualenv module, so we can use it to find the stdlib
               # Important! To work on pypy, this must be a module that resides in the
               # lib-python/modified-x.y.z directory
@@ -13,7 +14,13 @@ if os.path.normpath(distutils_path) == os.path.dirname(os.path.normpath(__file__
         "The virtualenv distutils package at %s appears to be in the same location as the system distutils?")
 else:
     __path__.insert(0, distutils_path)
-    exec(open(os.path.join(distutils_path, '__init__.py')).read())
+    real_distutils = imp.load_module("_virtualenv_distutils", None, distutils_path, ('', '', imp.PKG_DIRECTORY))
+    # Copy the relevant attributes
+    try:
+        __revision__ = real_distutils.__revision__
+    except AttributeError:
+        pass
+    __version__ = real_distutils.__version__
 
 from distutils import dist, sysconfig