s3:kerberos Return PAC_LOGON_INFO rather than the full PAC_DATA

s3:kerberos Return PAC_LOGON_INFO rather than the full PAC_DATA

All the callers just want the PAC_LOGON_INFO, so search for that in
ads_verify_ticket(), and don't bother the callers with the rest of the
PAC.

This change makes sense on it's own (removing boilerplate wrappers
that just confuse the code), but it also makes it much easier to
implement a matching ads_verify_ticket() function in Samba4 for the
s3compat proposal.

Andrew Bartlett

Signed-off-by: Günther Deschner <gd@samba.org>