Returns true if other is a GSSAPI.Name which contains a
name that refers to the same identity as this one.
This wraps GSS_Compare_name according to RFC 2743 section
2.4.3.
If either GSSAPI.Name object is uninitialized or contains an
anonymous identity then they are considered different, unless it
is the very same GSSAPI.Name object (that is an inherent pike
behavior).