Catching more principals in ads_keytab_verify_ticket()

[Doug VanLeuven]

Doug VanLeuven wrote:

> Even without the global option, updating the static list to include 
> cifs/<host>.<realm>@<REALM> might help fix bug 2414.  I've got a patch 
> for just that part right now.

This patch adds these variations to samba managed keytabs:
<global_myname())>.<REALM>@REALM that Michael Brown noticed
and
<global_myname())>.<realm>@REALM that I'm seeing from Enterprise 2003 
Native mode for out-of-realm dns domains.

Regards, Doug