Clean up "Demo" scripts to work with current python-ldap #561

There are a number of useful scripts that Michael Stroeder had written in the Demo/ sub-directory. However they've not been updated to work with current python-ldap. Also some of them have incorrect information. Filing this to track fixes to the demo scripts.

And a side question - I believe it is no longer necessary to store some of those scripts in the pyasn1 sub-dir beneath Demo, is that correct? thanks!