[krbdev.mit.edu #2143] Windows mslsa ccache not returning MS generated cross realm tickets to gssapi

[Jeffrey Altman via RT]

This is related to ticket 2139.  Doug has described a problem in which
the MS Tickets made accessible to the MIT krb5 gssapi implementation
cannot access services via cross realm.  apparently, the ms tickets do
not use the same convention for cross realm client identity mapping as
MIT krb5 does.  The problem is most likely in the default implementation
of the retrieval function which is depended on by the mslsa ccache
implementation.  

This needs to be fixed for 1.3.2.