As explained by Marc-Andre Lemburg, distutils needs to stay
backward-compatible. Therefore, it should use the old ConfigParser
module name.

Updated the documentation to use the new name.
Revert addition of the stub entry for the old name.

Georg, I am reverting your changes since this commit should propagate
to py3k.

Stub modules will be easier to track (and remove) if they are all kept
in lib-old/, instead of sprinkling them throughout the library.

so the tests work when run from an install directory.
They are currently skipped on the daily runs (not from the buildbots)
for checking refleaks, etc.

in r62788.