Heimdal provides Kerberos PAC parsing routines. Use them.

Heimdal provides Kerberos PAC parsing routines.  Use them.

This uses Heimdal's PAC parsing code in the:
 - LOCAL-PAC test
 - gensec_gssapi server
 - KDC (where is was already used, the support code refactored from here)

In addition, the service and KDC checksums are recorded in the struct
auth_serversupplied_info, allowing them to be extracted for validation
across NETLOGON.

Andrew Bartlett