[python-ldap] AD objectGUID conversion to string

[Joseph L. Casale]

> > Data in AD is typically utf-16 encoded.
>
> No! The LDAP interface of MS AD is LDAPv3 compliant and therefore uses UTF-8
> for LDAP syntax DirectoryString.

Well, to be specific I referred to data _in_ AD, not data _on the wire_. To be honest
it wasn't even relevant in this case but more for cases like setting unicodePwd.

But we digress...

jlc